PURE STOCK RULES
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.
Slight relocating of any component(s) due to damage may be allowed. Any relocating must be inspected and approved by tech inspector.
American or Canadian made only. 1957 to current
No front wheel drive cars.
No independent rears.
Wheel base, 98" minimum
BALLAST WEIGHT: Must be securely bolted to the inside of 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.
FRAMES: NOTE: Stock OEM frames On unibodied cars only, a homemade frame may be constructed using steel rectangular tubing only, with a minimum specification of 2" x3" x.120 wall thickness. The 3" dimension must be in a vertical position. If using this option, it must start at rear of the front stock OEM sub-frame and continue all the way back up over (not under) the rear axle and end where the stock OEM rear sub-frame ended.
All engine parts and components, internal and external must be OEM or exact aftermarket replacement unless otherwise noted in these Pure Stock rules. All engine parts and components must have casting/part numbers on them for identification. Must maintain stock bore and stroke combination for block casting number applied too. Engine must match chassis. (GM to GM, Ford to Ford, Chrysler to Chrysler).
1. ENGINE LOCATION: Engine block location measured as follows. Right front spark plug maximum 1 inch to the rear from center of right front top ball joint.
2. BLOCK: Bow-Tie 10185047, Dart 31161111 for Chevy, 31364175 for Ford cast iron
3. GM 602 crate motor option GM part number #88958602 must run 2 barrel carburetor Holley 4412
Cars must have decals displayed on the top of both doors in order to get the weight break. Engines may not have GM factory seals tampered with which means they are not racer re-buildable. If GM factory seals have been tampered with, that engine will be declared illegal, or must meet the standard Pure Stock rules with no weight break.
WEIGHTS: MINIMUM WEIGHT: 3000 lbs. For 602 Crate
3250 lbs. For all others
¦ ALL ENGINE PARTS MUST HAVE CASTING OR PART NUMBERS ON THEM FOR IDENTIFICATION.
All engines must maintain stock bore and stroke 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. +.060" 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 x3.5 stroke. +.060" 362.40 C.I maximum w/4C.I. allowance
A 4 cu. In. wear allowance is allowed for all manufacturers
Only cylinder heads produced by Chevy, Chrysler or Ford with their part/casting numbers legible will be allowed. Vortec Heads allowed Heads must be manufactured by manufacturer of engine block. Sand blasting, bead blasting, acid dipping, porting, polishing, and welding are prohibited. No relieving or un-shrouding of valves in combustion chamber. Any angle valve job permitted. Any amount of valve seats per cylinder head will be allowed to be installed for the purpose of repairing a head. No hand grinding, sanding, blending, or de-burring where a cutter or stone leaves off. No carbon fiber material. Valve stem maximum and minimum diameter plus or minus .005" must be: Chevy 11/32", Ford 11/32", and Chrysler 3/8". Milling/angle milling any amount allowed. Screw-in rocker arm studs allowed. No high performance or racing heads allowed if you aren't sure ask a tech inspector this is class is pure stock.
4. PISTONS: Flat top only. OEM or exact aftermarket replacement for block applied to. Forged pistons are optional. No modifications except for balancing.
5. CONNECTING RODS: OEM or exact aftermarket replacement for block applied to. No modifications except for balancing.
6. CRANKSHAFT: Any steel or cast iron crankshaft is allowed providing it maintains stock stroke as manufactured for the engine block used. Aftermarket OEM replacement crankshafts with holes drilled through crankpins are allowed providing they maintain stock appearance and specs. No lightweight cranks, as defined below. Minimum rod and main journal sizes must be Chevy, Ford, or Chrysler specs only. Minimum rod journal is 2.100". Knife-edging, narrowing, or cutting down the diameter of the crankshaft counter weights is not allowed. No polishing of the crank
7. CAMSHAFT: Hydraulic only. No roller. Must maintain OEM firing order for block applied to
8. ROCKER ARMS: Full roller aluminum rocker arms any ratio allowed. Ratio mixing allowed. No stud girdles.
9. INTAKE MANIFOLD: Stock OEM passenger type 2 barrel intake only. No modifications. Plugging unused openings permitted. Aluminum intake with Vortec ,Chrysler W-2 heads, must use 2bbl adapter plate. 4 barrel with 602 crate. Only.
IGNITION: OEM type system only. Any coil, module, cap, spark plug wires allowed. Must maintain OEM firing order for block applied to. No MSD ignition parts
BATTERY/ELECTRICAL: 1battery only. Maximum 12 volts Battery under hood or in trunk only. If located in trunk area, must have external charging post to prevent any sparks while charging battery and fuel cell must be properly grounded with a strap from fuel cell cap ring to chassis.
CARBURETOR: Any American Stock OEM 2 barrel carburetor with no adapter plate. The Holley Can use adapter plate with 602 crate motor. carburetor part #4412 is allowed and must run a maximum spacer adapter of 1 1/16", including gaskets.
No aftermarket carb. Modifications Ex. No VDL, BRASWELL, BAKER, ECT. Must be stock Holley.
CARBURETOR MODIFICATIONS ALLOWED ARE LISTED BELOW, ANY OTHER MODIFICATION NOT MENTIONED IS NOT LEGAL
Holes drilled in the throttle plates for proper idling.
Drilling, tapping, and plugging of unused vacuum ports.
Welding of throttle shaft to linkage arm.
Drilling of idle of high air correction jets.
Milling of center carburetor body metering block surface a maximum of .015" on each side.
Removal of choke plate and shaft.
The jets may be changed as needed.
FUEL: Gasoline only. No additives.
Fuel cell: Mandatory. 22 gallon maximum. Securely mounted in trunk only. Must open trunk to refuel. Must have tip-over valve in stalled. Fuel lines through driver's compartment must be in steel pipe or conduit, or braided stainless steel.
AIR CLEANER: Conventional round type air cleaners only. Air cleaners that provide ventilation through the top cover (such as the K&N brand) are permitted.
EXHAUST: Any style headers are allowed. Mufflers mandatory, any type/brand. Maximum exhaust pipe diameter 3" inch. Exhaust must extend behind driver's seat at least 12 inches. Must remain under car at all areas and be securely mounted.
SUSPENSION: OEM style suspension only. OEM or exact aftermarket replacement parts and components unless otherwise noted in these Street Stock rules. All parts and components must be in original OEM location unless otherwise noted in these Pure Stock rules. Reinforcement of mounts allowed. Any reinforcement must be inspected and approved by tech inspector. Lowering blocks allowed.
¦ BRAKES: Operable and effective four wheel hydraulic brakes mandatory on all four wheels at all times. Rear disc brakes may be installed if that particular manufacturer had used them in production and providing the rotors and calipers are stock OEM parts. No brake bias adj, No wheel shut offs. Note: Brake rotors front or rear may not be drilled for any reason.
1. Coil springs: Aftermarket allowed. No Externally Adjustable spring cups allowed front and rear. OEM trailing arms only, must utilize rubber bushings. No jacking bolts
2. Leaf springs: Aftermarket allowed. No extra holes in any mounts. Non adjustable slider system will be allowed.
3. Upper A-frame Tubular steel aftermarket upper A-frames are allowed as follows.
- Must be one-piece steel minimum wall thickness of .095.
- Cross shaft must be steel only.
- Ball joints may be any OEM or aftermarket type.
- Chassis cross-shaft mounts for upper A-frames may be fabricated and relocated.
- Any excessive cutting of A-frames must be inspected and approved by tech
- A-Frames may be reinforced.
- There can be no form of adjustment other than caster/camber.
- Do not have to maintain OEM length when converting to tubular steel aftermarket upper -A-frames. If using OEM upper A-frame, must maintain OEM A-frame dimensions for chassis/front clip applied to.
4. Torque arm: Must match chassis/front clip applied to. OEM, exact aftermarket replacement or fabricated to OEM dimensions. Must retain OEM method of operation. Reinforcement of mounts allowed. Any altering, fabricating, relocating or otherwise changing to other than OEM must be inspected and approved by tech inspector.
DRIVESHAFT: Steel drive shafts only. Steel drive flanges only on both ends. All cars must have a suitable driveshaft sling not to exceed 12" behind transmission, around drive shaft. Driveshaft must be painted white.
SHOCKS: Any stock or after market allowed. The only aftermarket rebuildable shock allowed will be Bilstien Hiem to Hiem rear, stock mount front. Steel bodied after market shocks with welded ends are allowed. Gas filled OEM replacement will be allowed. One (1) shock per wheel only. Shocks may be remounted, if exceeds more than 4 inches from original location, must be inspected and approved by tech inspector.
DRIVERS SEAT: Seat must be a minimum of 25 inches measured from the center of the rear axle housing, to the rear of the bottom of the racing seat.
STOCK OEM BODY:
Bodies and overall appearance must retain all stock OEM dimensions.
No lowering or offsetting body. Body must be centered on chassis.
All doors must be welded closed.
Interior must be gutted.
All body moldings and door handles must be removed.
Inner fenders may be removed.
All cars must have a rear firewall, between the driver and the fuel tank completely closed off.
Floor must run from door to door and front to rear. Do not have to follow original contour.
Firewall between the driver and engine must be completely sealed off.
Hood scoop allowed. Must be sealed on all four corners 5 inch maximum Height, 20 inch maximum width and length. Hood scoop must be inspected by tech inspector.
General Appearance: Aftermarket bodies are allowed, providing they look stock and match the wheelbase of the frame being used. Bodies must be stock appearing and mounted in stock location on frame. Stock manufacturers sheet metal or aftermarket body must maintain the OEM fit and appearance Bodies, engines and chassis must match GM for GM, Ford for Ford, and Chrysler for Chrysler. No wedge shaped bodies or flat body panels are allowed. Officials reserve the right to reject any body or parts.
Body width: maximum body width measured anywhere along the contour of the car may not exceed 82".
Allowable body materials: Allowable body materials: All parts of the body must be either steel or aluminum,or aftermarket composits.
Roof: Must be stock OEM steel or approved one piece fiberglass construction.
Hood/Trunk: One piece aluminum or fiberglass, or after market composites. Lift off hoods and trunks are allowed as long as they are fastened safely to properly seal off engine and trunk area. Aftermarket manufactured in hood style or if fabricated 5 inch maximum Height, 20 inch maximum width and length. Hood scoop must be inspected and approved by tech inspector. Must be sealed off.
Bumpers/Nose: Front and rear bumpers may be of the hard plastic type. Front nose must be stock appearing. No dirt style noses will be allowed such as Performance part numbers 331040, 281040, 251040, etc. Front and rear covers may not be widened from stock width. Tailpiece must be stock with a bumper cover. No flat sheet metal will be allowed.
Dash: Dash may be removed, providing the steering column is secured and remains in stock location. New dash may not protrude any further back than original OEM dash, and must be even (in one plane) all the way across the car.
Firewall: A full steel firewall of at least 18-guage thickness is mandatory with all holes securely covered to isolate driver from fire front and rear. Front and rear firewall must extend from fender to fender in as straight of a line as possible. No excessive firewall cutouts or tunneling for exhaust clearance allowed.
Inner Tin Work: No sheet metal extending from passenger side dash back to rear shelf is permitted. No cockpit type tin work allowed.
Floor board: A full floorboard must be retained from the engine firewall to rear firewall and from door to door. Do not have to follow original contour. No angular tinwork or cock pitting allowed.
Spoiler: No spoilers allowed.
Visors: One 3" visor allowed, from a pillar to a pillar, and from top of windshield seam down.
Rub rails: Rub rails 1 x2 x .095 minimum only. Flush mounted to body. No sharp 90 degree or bolts extending off of rails.
WHEELBASE AND TREAD:
Must maintain stock specifications for type of chassis. No wheelbase setbacks are permitted. No rear end offsets (this applies to all four corners of the car). Maximum tread width front and rear is 81" (with ˝" tolerance) for all cars, measured from outside of tire sidewalls. Minimum wheelbase allowed - 107" for both sides.
American Racer tires only.
No wheel plugs or covers. Steel wheels ONLY - 8 inch maximum. 3 inch backset only. 5 inch maximum outside measurement from outside flange of the wheel. Bead lock style wheel allowed on front and rear right side only. No wheel spacers.
BUMPERS: All bumpers must be stock OEM. Bumpers may be reinforced behind the bumpers only on side rail on each side of the car between the front and rear. Maximum of 12" OD will be allowed. No sharp ends. Ends must be capped off. Rear bumpers must have full cover over them. Unless they are stock OEM.
ROLL CAGE: All cars must have a complete roll cage. 1.5 to 1.75 OD. All welds must be completely around. All 90 degree bends must be gusseted. Minimum cage thickness is .095. All drivers must have a minimum of 2" between their head and the top of the roll cage. Bars above drivers or any other bars a driver's head may come in contact with must be covered with shock resistant padding. All steering wheel hubs must be padded. All cages must have a minimum of three (3) side bars on each side. Upright bars must be gusseted. No soft steel.
TRANSMISSION: All transmissions are to remain stock OEM. No parts added, removed or altered. Basic transmission cooler allowed. All standard transmissions must have an OEM clutch and flywheel. No triple disc. No overdrives. No special order transmissions. All cars must have a reverse gear in working order. Stock OEM pressure plates.
REAR ENDS: Stock OEM rear only. Rear end must be welded or spool. 9 inch Ford rear end housing highly recommended. Floater style allowed.
SAFETY: All glasses must be removed. No mirrors. Window net on driver's side is mandatory. It is mandatory for the driver to wear a neck collar and that a fire extinguisher is in reach of the driver. A full screen must replace the windshield. Racing seats are mandatory. No fiberglass seats, aluminum or steel seats only. Racing seat belts with shoulder straps are mandatory. Steel braided fuel line is optional. All cars must have the hood on while on the racing surface. All drivers must have a full face approved helmet and gloves. Driver must also have a fire suit (no overalls). Fire resistant underwear, arm restraints, and racing shoes highly recommended.
One way radio/scanner is MANDATORY. Freq. 454.000 mhz
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. The driver's seat must be securely fastened to frame or cage in six spots, with a minimum of six 3/8" bolts, four on bottom and two 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).
Rt 5 Vernon, NY
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