BIG BLOCK MODIFIED
Body and chassis rules refer to 358 sections.
BIG BLOCK MODIFIED ENGINE SPECIFICATIONS
Only stock OEM American long block (in length) manufactured V-8 engines
(GM, Ford, or Chrysler) are permitted.
Aftermarket Dart and Merlin cast iron blocks are permitted.
No aluminum blocks are permitted.
Only normally aspirated engines are permitted.
Maximum displacement of 467 cu. in. Minimum displacement of 396 cu. In.
A 10 cubic inch max. limit will be allowed for wear.
No reverse rotation engines.
Engine limited to one four barrel carburetor using Holley components.
Not to exceed 4 ventures.
No fuel injection, no nitrous oxide injection, no turbo chargers, or
Superchargers are permitted.
No fuel or air may enter by any means other than stock operation of the
No in-line ventures carburetors.
Optional as to design or manufacturer, but the manifold must allow for the
mounting of only one 4 barrel carburetor.
Must be cast iron or cast aluminum only.
Porting is permitted.
Optional as to design or manufacturer but must be made of cast aluminum
or cast iron only.
Any form of porting is permitted.
Valve sizes are optional.
Titanium valves and retainers are permitted.
No hollow stem valves or liquid cooled valves are permitted.
Only 2 valves per cylinder are permitted.
Only one spark plug per cylinder.
Optional as to design or manufacturer but camshaft must be in block in
Chain or belt drives are permitted.
No overhead cams are permitted.
PISTONS / RODS / CRANKSHAFTS
Aluminum pistons only, with no coatings of any kind are permitted.
Any steel or cast iron crankshaft is permitted.
Any design, length, or make of steel rods are permitted.
No titanium crankshafts or rods are permitted.
Any kind of ignition is permitted, as long as it is mechanically driven in the
No crank trigger ignition systems are permitted.
Only one ignition coil and one ignition box (amplifier) are permitted on the car.
Traction control devices are not permitted. Traction control devices that use the brakes are also illegal. Violators are subject to suspension and/or expulsion from Utica Rome Speedway.
Ignition boxes must remain as manufactured with no internal or external alterations. Wiring must remain as designed by box manufacturer.
No external timing adjustment
No adjustable rev boxes
Conventional or dry sump may be used.
Internal or external pump is permitted.
Oil coolers are optional.
Only one oil tank and one oil cooler are permitted. Oil pan must be made from steel or aluminum only.
Air pumps / vacuum pumps that suck air from the oil pan are not permitted.
Oil pan must have a 1" plug on the left side to allow for verification of steel crankshaft and rods.
Oil pans will be pulled down only when protested or in the absence of the 1"plug.
The oil tank and the oil cooler may be mounted outside the frame rails.
Oil tank maximum capacity not to exceed 12 US quarts.
Tank and cooler must be fully enclosed by the body and must be securely mounted. See cooler location in minimum specification rules. Excessive bracing used for mounting these items to obtain more left side weight is subject to the discretion of the track inspector.
No nitrous or any other additives are permitted. All fuels are subject to random testing at each track.
No electric fuel pumps are permitted.
THE FOLLOWING RULES APPLY TO THE 358, BB MODIFIED DIVISION, THESE RULES ARE MANDATORY AND WILL BE STRICTLY ENFORCED.
Any altering, fabricating, relocating or otherwise changing any part or component not specifically mentioned within these rules must be inspected and approved by the tech inspector.
All cars are subject to inspection at any time. All cars must be free from mechanical defects and be in safe racing condition. Track or Series officials' decision regarding any safety infractions will be final.
¦ Only round steel roll over bars may be used. Front and rear roll bars must be connected at top in a cage type configuration. Two round horizontal side bards on each side are mandatory. The top side bar must be a maximum of 20" below the top roll bar. Proper bracing and triangulation on front and rear roll bars is required. It is highly recommended that all roll bar bracing be a minimum of 1 ½" diameter by .095" wall thickness. A minimum of one diagonal bar across the top of the roll cage is mandatory.
¦ The rear main roll bar hoop must be a minimum of 26" measured across from outside to outside of tubing and must maintain that measurement from the bottom all the way to the top of the cage. Bottom of the rear roll bar must be welded to the 2 x 4 frame (no outriggers). The front roll bar must be measured and constructed the same way, except that the allowable taper in the frame rules will govern the width dimension. Only two roll bar diameters will be allowed. Roll bars of 1 ¾" diameter will require a minimum of .095" wall thickness. Roll bars of 1 ½" diameter will require .120" wall thickness.
SEAT BELT AND HARNESS:
All cars must be equipped with 5 point seat belts. All belts must be securely fastened to the frame or cage. Bolts may not be inserted through webbing for mounting. Seat belt webbing that comes into contact with any sharp or un-radiused metal edge must be protected from that edge by means of push on grip vinyl trim. The areas of concern are the webbing slots in the metal racing seats. All the seat manufacturers either roll the edge or supply the seat with
trim protecting the webbing from abrasion or cutting under impact conditions. Webbing entry slots into the seat with an existing metal roll of 1/8 inch smooth radius will not require vinyl trim. The areas where the webbing slot has been enlarged by filing or cutting are of particular concern. In most instances the edges have been left sharp, increasing the incidence of belt failure. As racing seat belts are subjected to severe conditions, it is required that worn/frayed belts are replaced immediately, and encouraged that undamaged belts are replaced every 24 months. The date sewn into the webbing should be used as a guide. Where the seat belt date is known to be "new old Stock", it is acceptable practice to extend the replacement date on that set of belts to 36 months from date of manufacture. Damaged belts will not be permitted.
¦ Shock resistant roll bar padding must fully cover all bars that may come in contact with the driver's head while strapped in the seat. On center type steering, all housings, lines, and fittings must be covered with shock resistant roll bar padding. The steering wheel center must also be padded. The starter housing and any other points of contact that could potentially injure the driver must also be adequately padded.
¦ Driver's seat must be securely fastened to frame or cage in six spots, with a minimum of six (6) 3/8" bolts, four (4) on bottom and two (2) on the seat back. All seats must have a minimum 1/8" steel plate under and up the back 4" and be as wide as seat. The seat must be one piece high back type only. The seat must be made of aluminum only (no fiberglass). Seat and steering must be centered in frame.
¦ All cars must be equipped with 3" width safety belt and shoulder harness with 2 belts over the shoulder. Buckles must be of the quick release type. Also, there must be a minimum of one submarine strap. All belts must be securely fastened to the frame or cage. Bolts may not be inserted through webbing for mounting. Cam lock seat belts are not allowed. If belts have
cotter pin locks, the pins must be in place. Belts may be rejected if not in good condition. The sternum shoulder harness is highly recommended.
¦ All drivers must wear a 2000 or newer SNELL approved helmet and fire suit. Note: The following items are highly recommended: One piece fire suit, full face helmet, fire retardant underwear, arm restraints, gloves, racing shoes, and a neck brace or the HANS device.
¦ All cars must have a full steel wind screen of substantial material with a maximum individual hole opening of 2" by 1" by 1/16" (no chicken wire or aluminum). Screen must cover entire windshield area left to right across the cage and from top of cage down to hood or cowl. Clear lexan or safety glass windshields may be used for additional protection if they are in the driver's line of sight. They must be shatterproof and mounted behind the screen enabling driver to wipe them clean. Any additional windshield must not obstruct the emergency exit of the driver.
Adequate window openings on both sides of the car must be maintained for emergency exit of the driver. The minimum opening size is that which will allow a rectangular box with dimensions of 12" high by 30" long to be passed through the inside of the car from one window through to the other side. Any obstacles other than the driver's head rest, which prohibit the passage of the inspection box through the cockpit, must be removed.
¦ All cars must have a drive shaft cover. All cars with open drive shafts must have a tunnel, made from a minimum of 1/8" thick steel which extends from 2" under front edge of seat to the back of the transmission, covering the shaft and "U" joint, and output flange on top and both sides. It must extend completely down to floorboards. It must be held in place with a minimum of four (4) 3/8" diameter bolts at bottom connected to a substantial cross-member. This drive shaft cover must be a solid unit with no cut-aways for lightening purposes. NOTE: Closed drive type cars, torque tubes, or bells that already have a 360 degree covering from "U" joint back to seat will be accepted as is. To protect the driver, any suspension link such as a torque arm, coil over or trailer bar inside the driver's compartment must have a steel cable (1/4" in diameter or more) or clamp connecting it to a substantial cross-member to limit its range should it break loose. It is also recommended that all these parts have no sharp edges and are padded.
¦ Firewalls, both front and rear are mandatory. The rear firewall must extend from top of fuel cell to belly pan to isolate the driver from the fuels cell. Minimum .050" thick aluminum or steel only. A minimal amount of sheet metal may be cut out for drive shaft clearance. The front firewall must isolate driver from the engine compartment.
¦ Belly pans are mandatory and must extend from front firewall to rear firewall and be attached at both spots. It is mandatory to have a separate floor to protect the driver's feet in the event the under pan falls off. This extra floor must be attached to the frame or cross-member or both, and extend from the front firewall past front of edge of the seat.
¦ All crews must carry an operable fire extinguisher capable of extinguishing gas and oil fires. On board "flame-out" systems are recommended.
¦ Battery must be properly secured and must have top and terminals completely covered by rubber. NOTE: It is recommended that battery be mounted outside of driver's compartment, and that a battery shut-off switch be mounted and marked ON/OFF with a bright colored paint. The switch should be clearly visible, and easily accessed by the safety crew.
¦ All cars must have an ignition switch which is easily accessible within the driver's compartment. The ignition switch should be marked ON/OFF with a bright colored paint and be clearly visible and easily accessible to the safety crew.
¦ A fuel shut-off valve must be mounted within easy reach of the driver and the safety crew. IT must be labeled in a clearly visible location with words FUEL ON/OFF with a bright colored paint.
¦ Fuel lines, power steering lines, and fittings running through the driver's compartment must be made from an approved braided type line only. No plastic or glass fuel filters allowed. High pressure lines and fittings or hot fluid lines running through the driver's compartment must be encased or shielded by a deflector to prevent driver injury.
¦ All cars must have four (4) wheel hydraulic brakes in good working order. Brake test may be held throughout the year.
¦ Rear wheels must have a minimum of five (5) lug nuts. A minimum of three (3) lug nuts is required on front wheels only. No knock off hubs on any wheel are allowed.
¦ A fuel cell with a maximum capacity of 24.5 U.S. gallons is mandatory. No pressure tanks are allowed on fuel systems. The fuel tank must be rectangular or square in shape on all sides with no protrusions, to allow for the measurement of fuel capacity. Cell must be fully encased in a steel container with a minimum thickness of 20 gauges. An optional aluminum container may be used with a minimum thickness of .060". The cell must be fully foamed with just a minimal cut-out for filler. Cut-out may be no larger than 6" wide by 10" long by 7" deep. Fuel lines must siphon from the top only. There must be a one-way safety valve in the vent line. Fuel tank must be mounted behind driver. Fuel tank must be secured by at least two steel straps (each strap must be a minimum of 1" wide) and bolted with a least 5/16 diameter grade five (3 line) bolts.
¦ A horizontal bar with minimum dimensions of 1" by .095" wall thickness must be mounted behind the fuel cell for rear impact protection.
¦ Exhaust headers must be safe for the driver and exit past the driver's seat. NOTE: all exhaust pipes must exit facing the rear of the car. Pipes may not exit through the doors or in front of the rear tires.
¦ No mirror or reflecting devices allowed.
¦ Inspectors reserve the right to request body or sheet metal to be replaced and painted if it has any sharp edges or is not looking presentable to the sport.
¦ A minimum of two (2) throttle return springs are required.
A steel toe loop on gas pedal is recommended.
No fuel drums allowed on track premises.
MODIFIED STYLE BODY - RULES APPLY TO 358, BB MODIFIED CLASS.
ALL MEASUREMENTS WILL BE TAKEN WITH OR WITHOUT DRIVER OR FUEL.
Side door panel: minimum 60", maximum 70" in front of centerline of the rear axle. Doors must be straight up and down within that measurement. Front door extensions will be allowed up to 20" behind the front axle centerline. Front door height must be a maximum of 38" and minimum of 30" from the ground measured at 60" from rear axle centerline. Ground clearance on the bottom of the doors must be a minimum of 6" and a maximum of 12" from the ground. All doors and rear quarter panels may have a maximum lip of 1 1'2" rounded at 90 degrees and facing inward only, on the top and the bottom.
REAR QUARTER PANELS:
Rear quarter panels must match each other. They must be a maximum of 45" and a minimum of 40" from the ground at the rear and continue in a straight line with top of door. You may use a fender flare, up to a maximum of 2" from the body but overall body width must still be maintained at a 68" maximum. Rear quarter panels can extend back to 48" maximum at top and may incline down to 44" maximum at bottom measured from center of rear axle to rear of car. Ground clearance on rear quarter panels must be a minimum of 8" and a maximum of 16".
Any violators may be subject to fines and/or disqualification.
BODY MATERIAL ALLOWED: Only aluminum or steel will be allowed for all inner and outer body panels. The roof must be fiberglass only. Hood, Hood scoop, Windshield cowl, right rear inside tire clearance cover and front spoiler may be constructed of either fiberglass or aluminum. Only clear lexan will be allowed for the rear spoiler and the rear wing windows.
¦ Roof must be centered from side to side on roll cage and also be centered on frame (No offset bodies). Leading edge of roof must be fastened in a stationary position a minimum of 33" and a maximum of 48" in front of rear axle centerline. The roof must be securely fastened at the back and on both ends.
¦ Length of roof: maximum 60", minimum 48". Width of roof: maximum 52", minimum 48". Must display a turtleback style and shape. Roofs cannot change shape or location while racing.
¦ Overall height (top of highest point): minimum 52", maximum 61", measured from the ground. Maximum roof angle is 5 degrees on a gauge with no deflections in roof contour.
¦ All roofs must be one piece fiberglass only and be a single ply, one contour inside and out. No carbon fiber. Roll bars must be exposed from any angle. No vertical metal used to mount roofs will be allowed covering the roll bars. Roof must be a minimum of ten pounds.
FRONT DOOR POSTS:
¦ Door posts must be 2" wide from the side view from the roof all the way down to the door. The posts must be flat, no angle shape or round tubing will be permitted. No lexan vent windows or excessive sheet metal will be allowed in the vent corner where the post meets the door panel.
BODY WIDTH AND GROUND CLEARANCE:
¦ Body width (measured anywhere along the body line, front or back): 68" maximum, 64" minimum. Minimum chassis ground clearance 2 ½". No fan or ground affects cars. No rubber skirts, fins, or spoilers are permitted under the car.
¦ The rear spoiler must be clear lexan with a maximum height of 5" from the rear deck and must not have any writing or stickers on it. The rear spoiler must be non-adjustable (no hinges or slides).
¦ A maximum of three vertical supports may be used to fasten the spoiler to the rear deck. These supports may not exceed 2" in vertical height and 10" in length
¦ Must be a maximum height of 45" and minimum of 40" from the ground.
¦ Rear deck lid (i.e. trunk lid) must be fully enclosed from quarter panel to quarter panel and have a minimum height of 9" and a maximum of 14" in vertical coverage behind the fuel tank. Left and right rear trunk lids must be symmetrical in size and shape and show no specific bulge or extension to cover fuel filler hose or apparatus within the 9" to 14" of vertical coverage. This panel must completely cover the fuel cell, filler hoses, and vent lines. The fuel tank must be completely enclosed from the bottom of this panel to the bottom of the fuel cell! The fuel cell must also have both sides completely covered by sheet metal in addition to the container it is enclosed in. Within these dimensions there can be no openings. No openings from top of fuel cell to bottom of trunk lid are permitted.
¦ Any vent line nozzle used for catch can purpose must be mounted on the left side quarter panel only. No crew member will be permitted behind the car during pit stop refueling.
HOOD, NOSE, AND FRONT SPOILER:
¦ The hood, nose, and front spoiler can be no wider than 36" and no narrower than 24". Shock covers or deflectors may not be part of or riveted to the nose or spoiler exceeding the 36" width maximum. Fabric shock covers are allowed as long as they are used for the prevention dirt getting at shock piston and not used for any aerodynamic advantage. The front spoiler may not extend any more than 20" in front of the front axle centerline. The front spoiler must be non-adjustable (no hinges or sliders). Hood shall be considered from the front roll cage to on top and even with the front of the radiator. Nose piece shall start where hood ends to a maximum of 20" in front of front axle centerline. They all may have 2" maximum lips up or down on both sides following the contour of the body. The hood, nose, and spoiler may not overlap each other's location on the frame. Any part of hood may not exceed 10 degrees nor can sheet metal have an opening or extrusion between the hood and nose. Hood must extend over the radiator and have complete sides.
¦ Front windshield opening: for the optional ram air style scoop, a 10" vertical measurement from lowest point of roof or roll cage to highest point on hood (including the hood scoop) is required. For the conventional type scoop an *" vertical measurement will be required.
¦ An optional hood scoop mounted on top of the hood for the purpose of enclosing the carburetor or ram air will be allowed providing they meet the following specifications. Both style scoops may use fiberglass. The option of keeping the hood fully enclosed will also be allowed.
¦ Ram air type scoop: Maximum length, 30" measured from rear motor plate to front of hood scoop. Maximum width, 18". The front vertical opening of the scoop can be a maximum of 6" at the beginning of the scoop only. The overall height of this scoop must maintain a minimum of 10" of vertical vision for the driver. This measurement will be taken from a horizontal line from the highest point of the hood scoop to the lowest point of the front roll cage and/or roof. Hood scoop must be fastened to the hood and completely enclosed the carburetor and air filter. A tolerance of ½" will be allowed on all theses dimensions.
¦ Conventional no ram air scoop: a maximum of 25" is allowed from center of the carburetor forward. The width allowed is a maximum of 22". The height must maintain a minimum of 8" of vertical vision from the top of the scoop to the lowest point under roof or roll cage.
INTERIOR SHEET METAL:
¦ Any horizontal body support, other than the inner pods, whether in front or rear must be a maximum of 1" deep by 1" thick tubing or flat stock only. No inside or outside wings, spoilers, air foils, or wind deflectors are allowed.
No double panels will be allowed that creates a wing effect. A 1" maximum reinforced lip will be allowed on all lexan, but all allowable measurements must still be maintained. All inner sheet metal used must completely cover areas form door to door, quarter panel to quarter panel. NO holes or openings are allowed in this area.
¦ No vertical fins, air dams, or fairings allowed on the sides or behind the roll cage. Sheet metal must be a flat single plane across the inside of the car. No covered roll bars for aerodynamic purposes are allowed. Sheet metal that is one piece and part of a body panel bent around tubing (for purposes of protecting the driver or finishing off panel) is not considered an aerodynamic advantage provided it is not to excess. No louvers or holes in the interior or exterior sheet metal are permitted with the exception being the cooling of the radiator, engine, and oil cooler.
¦ The floor pan or under pan may not be any wider than the frame, from front to back, and may not have any lips or fins facing downward.
¦ Track or series handicapper reserves the right to issue or change a car's number to prevent duplication and maintain proper records.
¦ Team cars must be clearly distinguishable from one another and use a different number or letter.
¦ All numbers and letters will be limited to three digits. If three digits are used, two shall be primary numbers. Numbers are required on roof, nose, rear deck and both doors.
¦ All numbers and letters must be a minimum of 18" high on the roof and doors, and 8" high for the rear deck and nose. All numbers and letters must be of equal size and painted or decaled.
¦ If numbers "3", "6", or "9" are used make sure that they are distinguishable. Do not let nerf bars block visibility.
¦ Only round steel roll over bars may be used. Front and rear roll bars must be connected at top in a cage type configuration. Two round horizontal side bars on each side are mandatory. The top side bar must be a maximum of 20" below the top roll bar. Proper bracing and triangulation on front and rear roll bars is required. It is highly recommended that all roll bar bracing be a minimum of 1 ½" diameter by .095" wall thickness. A minimum of one diagonal bar across the top of the roll cage is mandatory.
¦ The rear main roll bar hoop must be a minimum of 26" measured across from outside to outside of tubing and must maintain that measurement from the bottom all the way to the top of the cage. Bottom of the rear roll bar must be welded to the 2 x 4 frame (no outriggers). The front roll bar must be measured and constructed the same way, except that the allowable taper in the frame rules will govern the width dimension.
¦ Only two roll bar diameters will be allowed. Roll bars of 1 ¾" diameter will require a minimum of .095" wall thickness. Roll bars of 1 ½" diameter will require .120" wall thickness.
¦ Seat and steering wheel must be centered in the frame. The seat must be a maximum of 16" from the center of the rear end to back of seat bottom. A high back seat made completely from aluminum is mandatory. No fiberglass or carbon fiber materials are permitted.
¦ Only one (1) radiator allowed and it must be centered squarely, not angled, in front of motor in a vertical position. No plastic or carbon fiber allowed. No auxiliary cooling tanks or catch cans allowed in driver's compartment.
¦ The engine must be centered in the chassis and placed in an upright position. Engine set back: minimum 56", maximum 66" with ½" absolute maximum tolerance. Set back will be measured from the center of the front axle to the rear machined bell housing surface of the engine. No rear engine cars are allowed.
¦ Approved North American manufactured manual shift transmission only, no automatics. No overdrive or under drive transmissions allowed. No running through reduction gears. Transmission must be direct drive to rear end at racing speed. Transmission must have forward, neutral, and reverse gear in good working condition. From a neutral position with the motor running, a car must be able to go forward and backward in a smooth manner. Transmission must bolt to the bell housing.
¦ No chassis, driveline or suspension components made of carbon fiber allowed. Only two (2) universal joints per driveline. A drive line shield is mandatory (see safety rules for detailed requirements).
¦ Competition rears only. No hypoid type rears allowed. No limited slip type rear ends or hubs are allowed. No lockers or two speed rears are allowed. Rear end must have solid aluminum or steel spool only. Rear spindles may be steel or aluminum only. If aluminum it must be a one piece tube and spindle with a minimum outside diameter of 2 7/8" and maximum inside diameter of 2 ½". Live rear ends with aluminum or steel axles are allowed. The rear end or chassis must not be offset any more than 4" from center of the inside tire width, measured from the inside of the left rear tire to the inside of the right rear tire, at axle height.
¦ The front axle must be straight, one piece steel tubing only with no camber adjustments. No split axle or dropped axle allowed. All brackets on front the axle must be bolted or welded (no bird cages or slides). Modified type front spindles only. It is recommended that bearing shafts be made of steel., Chassis may not be offset any more than 4" from center of inside tire width, measured from the inside of the left front tire to the inside of the right front tire at axle height. Front wheels must be fully exposed. No fenders are permitted.
WHEELBASE AND TREAD:
¦ Wheelbase: minimum 106", maximum 110". This measurement will be taken from the center of the rear axle to the center of the front axle, for both left and right sides with a maximum tolerance of ½".
¦ Modified and 358-Modified tread width: front - maximum 86", minimum 74". Rear tread, maximum 86" minimum 80".
CHASSIS GROUND CLEARANCE:
¦ There must be a minimum of 2 ½" ground clearance from the chassis or anything attached to it, including any part of the body. No metal, lexan, or rubber air dams, fins, spoilers, or skirts are permitted under the car. No ground affects cars.
¦ No independent suspensions front or rear. No "A" frames or ball joints may be utilized for steering axis (kingpin only). No four wheel steering allowed that is actuated by steering wheel. All suspension systems must be mechanical with no form of electrical, radio, or computer assistance. No form of traction control is permitted.
¦ Any form will be allowed (torsion bars, coil over, leaf springs, etc.) providing they are made from steel. No carbon fiber or titanium is allowed.
¦Only one shock per wheel. No titanium.
¦ All cars must have four wheel hydraulic brakes in good working condition. No carbon fiber or aluminum rotors and pads are allowed. On live rear axles, one inboard and one outboard brake assembly is allowed. Brake test may be conducted throughout the year.
¦ Must be made from round steel tubing only, with a minimum diameter of 1 ¼" by .095 wall thickness for main bumper and all bracing. It must consist of two rails, an upper and lower. These rails must have four sockets or supports attached to the frame. The four tubes that support the bumper from the four frame sockets must be horizontal. These rails must also be a minimum of 6" apart and a maximum of 12" measured from top to bottom and maintain that measurement for a minimum width of 24" or a maximum width of 30". It must also have an 18" center measured from the ground up to the middle of the bumper. The front bumper may not extend more than 24" in front of front axle center centerline.
¦ No V-shaped bumpers, crash area must be flat and vertical for the full width of bumper. Bumper must have all rounded ends and no sharp edges.
¦ Must be made of round steel tubing only, with a minimum diameter of 1 ½" by .095" wall thickness for main bumper and all bracing. It must consist of two rails, an upper and lower, which must have four sockets and horizontal support bars attaching it to the frame. Theses rails must also be a minimum 10" apart and a maximum of 16" measure from top to bottom and maintain that measurement for a minimum width of 64" or a maximum width of 86". The rear bumper or any side bars cannot extend past the outside of tire sidewalls on both sides. It also must have an 18" center measured from the ground up to middle of bumper. The rear bumper may not exceed 52" in back of rear axle centerline.
¦ No V-shaped bumpers, crash area must be flat and vertical for the full width of bumper. Bumper must have all rounded ends and no sharp edges.
¦ Must be made of round steel tubing only, with a minimum diameter of 1 ½" by .095" wall thickness. All bracing must also be a minimum of 1 ½" outside diameter by .095" wall thickness. Maximum wall thickness must be .095" with no solid bars or ballast added inside. Rub rails must be outside of body panels but may not exceed the outside edge of the tires. The exception is the left rub rail only, which may extend an absolute maximum of 2" outside the left rear tire sidewall.
¦ Rub rail ends must be rounded with no sharp edges and bent at a gradual 90 degrees and must protrude a minimum of 6" back in past the body.
¦ Rub rails must be a minimum of 50" long, end to end.
¦ One fuel cell with a maximum of 24.5 US gallons is mandatory (used for gasoline only). Fuel tank height: 12" minimum from the ground to the bottom of the tank. Tank must be centered inside of the frame rails and be rectangular or square in shape on all sides for measuring capacity.
¦ Fuel tank must be fully encased in a steel container with a minimum thickness of 20 gauges. An optional aluminum container may be used with a minimum thickness of .060". Fuel tank must be fully foamed with just a minimal cut-out for filler. Cut-out may be no more than 6" wide x 10" long x7" deep. Fuel lines must siphon from top only. No fuel lines bigger than #10
¦ No auxiliary tanks. No fuel filters with more than ½ quart capacity.
¦ Fuel tank vent line must have an inline one-way valve for the prevention of fuel spillage.
MUFFLERS AND EXHAUST SYSTEM:
¦ Each car must have one muffler per bank. Mounting position front to back will be optional however the exhaust must exit past the driver. Each muffler must have a tail pipe no less than 10" long measured off the back of the muffler and must direct the exhaust to the rear of the car only. No exhaust pipe may face outside the car.
¦ Any manufacturer of exhaust header is allowed, but header material is limited to steel or stainless. No cross over pipes are permitted connecting the two banks of cylinders.
¦ If ballast weight is needed to make total weight, it must be securely bolted to the inside of the two main frame rails, must have at least two bolts per weight with nylon lock nuts. No welded studs of any kind. Must be painted white and have car # on it. Any added weights must be approved by tech inspector. This applies to all classes of cars.
These tire rules will be in effect for all events held at Utica-Rome Speedway
unless otherwise noted.
-American Racer will now be the mandatory tire for the 358, and Big Block Modified division at Utica-Rome Speedway.
-The right rear tire must be a compound of SD44/SD48
-The left rear tire must be a compound of SD33/SD38
The left front must be a compound of SD33
The right front can be a compound of SD33/SD38
-NO SQUARE TREAD PATTERN TIRES. EXAMPLE LATE MODEL TREAD
-American Racer tires are the only tires available at Utica-Rome Speedway. Tires are not only sold during race events at the speedway, but are also available at the speedway by calling Barb Clark at 315 725-5709.
¦ 358, BB Modified Division: Only aluminum wheels are allowed. No magnesium, steel, or carbon fiber is permitted. Bleed off valves are allowed.
¦ Rim width restricted to 14" maximum. This is measured from inside of left bead to inside of right bead on the wheel. Wheel diameter limited to 15" only.
¦ Bead locks are allowed. Any wheel or bead lock that is used must maintain a minimum diameter of 11" hole inside bead lock and wheel. Bead locks may be outside only, except the left rear, which may have an inside bead lock.
¦ No wheel covers or hub caps on the inside of the wheels are allowed. Wheel covers/hub caps are allowed outside of the wheels providing they are one piece, attached as part of the bead lock and maintain a minimum thickness of .090" with a minimum hole in the middle of 4.5".
¦ Foam inserts or corrugated plastic (with approved installation) may be allowed when track conditions warrant. No unsafe wheel covers attached by dzus buttons are allowed. This is at the discretion of the officials.
¦ Weights are taken including driver with no fuel added. Track scales will be official. No protests or appeals are allowed on their findings. NO tolerance of the total weight requirements will be allowed. Weight violations are subject to complete disqualification at the discretion of the track promoter and/or officials
¦ 358 division cars steel heads or aluminum must weigh 2400 lbs
Big Block Modified 2,500 LBS
Small Block Modified using SB2 heads must weigh big block weight 2500#
These weights are subject to change.
358-MODIFIED ENGINE SPECIFICATIONS
¦ This class is reserved for North American passenger car V-8 engines with cast iron blocks and cylinder heads. All engines must maintain stock bore and stroke combinations.
Engine Maximum Overbore
Chevy 350 C.I., 4.00" bore x 3.480" stroke. +.060" 360.08 C.I. maximum w/4C.I. allowance
Chry 360 C.I. 4.00" bore x 3.578" stroke. +.020" 363.28 C.I. maximum w/4C.I. allowance
Chry 340 C.I. 4.04" bore x 3.313" stroke. +.060" 344.76 C.I. maximum w/4C.I. allowance
Ford 351 C.I. 4.00" bore x 3.5 stroke. +.060" 362.40 C.I .maximum w/4C.I. ..allowance
A 4 cu. In. wear allowance is allowed for all manufacturers.
¦ BLOCKS: Stock OEM and cast iron performance blocks such as Chrysler ® Block, Chevy Bow-Tie, Ford-SVO, and DART are permitted.
¦ CYLINDER HEADS: Brodex spec aluminum, Bowtie steel, Dart steel, SB2, are the only cylinder heads allowed. Any porting allowed. Titanium valves and valve spring retainers are permitted.
¦ CRANKSHAFT: Any steel or cast iron allowed providing it maintains stock stroke as manufactured for the engine block used.
¦ RODS: OEM stock production or aftermarket solid steel are allowed. No titanium or aluminum. Maximum rod length will be 6". Engines with longer than 6" rods must meet stock OEM specs.
¦ PISTONS: Any make 3 ring flat top aluminum pistons only.
¦ VIBRATION DAMPENERS: May be any stock OEM or aftermarket steel or cast-iron only.
¦ CAMSHAFT: Any type allowed. No overhead cams. Roller rockers, Shaft Rockers allowed. Stud girdles will be allowed. No gear or belt driven cams. Lifters must maintain stock OEM diameters. Lifter bores must remain in stock OEM positions and angles, but may be re-bushed for wear. No lash caps allowed on valves.
¦ INTAKE MANIFOLD: Any American production as cast 4 barrel allowed (single plane aluminum only). No homemade type manifolds allowed. Part and casting numbers must remain visible and not ground off.
¦ CARBURETOR: Any American 4 barrel carburetor.
¦ IGNITION: H.E.I., magneto or ignition box will be allowed. No crank trigger systems allowed. One ignition coil and one ignition box allowed. Alternators will be optional.. Ignition boxes must remain as manufactured with not internal or external alterations. Wiring must remain as designed by box manufacturer.
No timing retarders
No adjustable rev chips allowed.
¦ LUBRICATION SYSTEM: Wet or dry sumps optional. Oil may be in steel or aluminum pan only. Oil pan must have ¾" inspection hole for connecting rod verification on left side of pan. Oil coolers are allowed.
¦ WATER PUMPS: Pumps, pulleys and fans are optional.
¦ FUEL PUMPS: Must remain in and be driven as stock OEM equipment. No electric pumps.
¦ FUEL: Racing gasoline or pump fuel only. No nitrous or any other additives. All fuels subject to random testing. Note: Any infraction of the engine or fuel specifications as mentioned above will result in complete disqualification.
Big Block and 358 Modified
Rt 5 Vernon, NY
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