r PURE STOCK CLASS RULES - 2017
** PLEASE NOTE: Ride height will be measured with the driver IN the car.
(Closed Chamber heads must no additional weight needed)
General Motors aluminum dual-plane intake manifold no addition weight
If the rules do not say you can do it, then don’t do it! Be sure to check the General Rules. All interpretations of rules by a Speedway Management or Speedway Technical Official are final. UNAWARENESS OR IGNORANCE IS NO EXCUSE!
Any American made car with a factory wheel base of 101 inches minimum – must be within 1 inch tolerance of year, make and model.
Wheel base may not be altered. Body must be stock for chassis.
No bump stops.
Minimum weight of 3,200 pounds, with a maximum of 55% on the left side.
Minimum weight of 3,300 pounds for cars with leaf springs, with a maximum of 53% on the left side. This may change with the competition.
Weight may be added to any competitor to ensure fairness of competition as follows: Aluminum Intake manifold (any engine): Is okay no weight penalty, except Crate engines. Stock flywheel must have a minimum of 25 lbs. Headers: are ok no penalty. Standard clutch and transmission: 75 pounds penalty.
All lead and ballast must be painted white and have car number printed on it. All ballast weights must be even with or above the bottom of frame rails. Any lost or loose weight will result in disqualification.
** Must be stock appearing for make, model, and year. No exceptions.
Factory roof, hood and trunk lid must be retained. Roof may be gutted! Trunk may be gutted but must retain stock floor pan and firewall. Hood must seal to cowl or windshield.
All holes in firewall and driver compartment must be covered over for safety.
No hood scoops or cowl induction. No aluminum hoods are permitted. Fiberglass hoods are permitted – 10-pounds weight penalty will apply.
May replace any corroded metal with 22 gauge or thicker sheet metal for door skins, fenders, and quarter panels. Must look like an actual car – no slab sides. Door must mount to rocker. No filler panel.
May remove rear floor to just behind B post of body, and rear firewall, but must have 22-gauge steel firewall sealed tight separating driver from fuel cell.
All cars must have a full, clear Lexan windshield.
Body must be mounted in stock location on frame – no sliding or shifting. A post mounting in correct frame hole (both left and right).
Hood must have a minimum of two (2) pins in front and two (2) pins in back.
Trunk lid must have two (2) pins and two (2) hinges, or four (4) pins.
Fabricated steel (stock appearing) trunk lid approved. No aluminum truck lids allowed.
May run 1 inch rub rail welded against body with capped ends, clean welds, no tire cutters.
May run pipe bumpers – maximum of 1-3/4 inch OD x .95-inch wall, square tubing, or stock bumper for car must be mounted in stock location with chain rapped and welded to frame. Minimum bumper height is 17 inches – maximum bumper height is 19 inches. Bumpers must have round corners that turn back into chassis. No open ends must be capped. Bumpers must not be installed farther out than 6 inches from the front frame horns.
All welds must be clean and ground – no tire cutters.
4. CHASSIS and SUSPENSION:
All suspension parts must be stock for the year make and model of the car. A – frame bolts may be changed to camber ADJ. May replace bushings with polyurethane or steel ok.
Coil spring must be a minimum of 8 inches and must fit in stock location without alteration of bucket. No spring rubbers or Gobblers allowed. No coil bound springs or collapsed springs allowed. All springs must be symmetrical from top-to-bottom.
May use adjustable bucket, but must require removal to be adjusted.
Leaf springs, stock multi-leaf only, may be used. May use lowering blocks and multi-hole rear shackles for adjustment.
Sway bar must be stock for the specific car. Maximum 1-3/8-inch diameter. No rear sway bars. No aftermarket sway bars.
Sway bar adjustable at left lower A frame only.
All front and rear suspension components must remain stock. All suspension parts must match frame. No alteration of suspension allowed.
No bump stops.
Stock passenger car spindles and hubs only.
No lightening or grinding of any suspension part allowed.
No steering quickeners allowed. Stock steering components include drag link and stock length tie rods. No interchange of uni-body, mid-size metric, and big metric/steering parts.
Spindles, rotors, calipers, and bottom A-frames must match chassis being used. Steel lower A-frame bushings are allowed. The hole must be in the center of the bushing.
Shock absorbers must be mounted on stock upper and lower mounts. No modifications to shock mounts allowed, and mounts must be in stock locations. No tie rod end, heim end or aluminum shocks allowed.
One (1) shock per wheel – total of four (4) shocks per car. No coil over shocks allowed. One-inch (1”) spacer will be allowed on the left-rear of the car (only). Shocks must be steel body, one (1) piece and non-adjustable. No remote or external canister type of shocks allowed. No aluminum gland nuts or shafts. No Schrader Valve! (PRO SHOCK, AFCO, CARARAS OKAY) ABSOLUTELY NO ALUMINUM OF ANY KIND!
No bulb tops. May have removable bushing on shaft end of body. Bushing holder/eyelet must be attached to body. No Schrader or bladder style valves allowed.
Must use stock type shock ends top and bottom. Front half of shocks can be covered.
Steel body shocks must be mounted in stock location. $125.00 claimer for four (4) shocks after a race and swap. No rebuildable shocks. No adjustable shocks. No aluminum gland nuts or shafts. Must be on lead lap.
Six-inch (6”) ground clearance minimum frame and body between the front and rear tires, measured with the driver out of the car.
No lead below the frame rails.
Must run stock Holley 4412 2-barrel or Quadra-Jet 4-barrel carburetors. No modifications can be made except as specified. May remove choke plate and shaft.
May change jets and power valve.
May use any adapter from carburetor to manifold – maximum thickness 1.625 inches including gaskets.
Stock OEM cast iron. No porting, polishing or port matching.
May use Edelbrock RPM Performer – General Motors 7101 - Ford 7121 - Mopar 7176. General Motors aluminum dual-plane intake manifold is also approved
Stock flywheels must have a minimum of 25lbs.
Crate engines are excluded from the 50 pounds penalty.
Any 12-volt battery fired ignition (only).
Must be mounted in driver’s compartment behind driver’s seat. Must be mounted securely and in a box with a lid.
Stock OEM distributor – no high-performance parts. No MSD coils or modules.
8. ENGINE SPECIFICATIONS:
Must be same manufacturer as car and mounted in stock position.
Maximum cubic inch displacement: 362 cubic inches.
Stock crankshaft for engine.
Maximum over-bore is .060.
Crankshaft must be stock production or OEM stock replacement. 50 pounds minimum balancing permitted by drilling holes – no grinding. No knife edge or bullnose cranks permitted. No polishing of crankshaft.
Rods must be stock production or OEM stock replacement. OEM length per original engine specifications. No high-performance rods permitted. Grinding on rods permitted for balancing only. No polishing of rods.
Pistons must be stock production or OEM stock replacement and must be same configuration as stock cast or forged GM. Must have four (4) eyebrow flat top. No fly cutting. Floating pins may be used.
9. GENERAL MOTORS (GM) 602 CRATE ENGINE:
May run GM 602 sealed crate engine as received from the factory, with no modifications of any kind, subject to inspection by Speedway Technical Officials.
GM part number: 8 8 9 5 8 6 0 2 and 1 9 2 5 8 6 0 2
Compression ratio: 9-to-1.
No options allowed.
10. CYLINDER HEADS:
Stock production OEM cast iron cylinder head for engine being used (Open or Closed Chamber Heads Okay Minimum 63CC )
No vortec heads allowed.
GM 350 heads on 350 c.i.d. engine - 305 heads on 305 c.i.d. engine no less than 63 cc’s on 350. Maximum compression ratio: 10-to-1.
Ford 351 heads on 351 c.i.d. engine - 302 heads on 302 c.i.d. engine. Maximum compressions ratio: 10-to-1.
Mopar 360 heads on 360 c.i.d. engine - 318 heads on 318 c.i.d. engine: Maximum compression ratio: 10-to-1.
No porting or polishing, No gasket matching, No grinding of any kind.
May have 3 angle valve job, no angle more than 70 degree. May run screw in studs, must be stock size.
Guide plates OK.
No angle plug heads.
1.94 intake, 1.50 exhaust, max valve size.
Valve spring must be stock size and symmetrical from top to bottom 1.250” diameter. Spring seat valve pressure closed 120lbs. max.
No aftermarket heads are allowed.
Hydraulic flat tapped cam only. (NO DEGREEING OF CAMSHAFT ; STOCK POSITION)
Maximum lift 450 at valve.
Check at push rod or cam lobe times the rocker.
Ratio - Rocker must remain stock for engine: General Motors: 1.5 - Ford: 1.6 - Mopar: 1.5.
Stock automatic transmission with all working gears (forward and reverse) and working torque converter.
Torque converter must be minimum 10 inches in diameter.
No lock-up converters. No power-glide transmissions.
Must have all stock parts – no light weight parts.
May run 3-speed or 4-speed manual transmission with stock clutch and flywheel (L88 flywheel) approved. 75 pounds weight penalty.
Stock clutch and clutch disk.
No 5-speed or 6-speed transmissions allowed.
Must have a functional shifter - No push – pull rods.
Must be stock for the year, make and model of the car.
May be locked.
Mini-Spools are approved for use.
No full spools.
All four (4) brakes must work at all times.
Stock pedal and master cylinder.
May remove factory proportioning valve.
No aftermarket brake bias or shut-off valves.
No rear disc brakes. No aluminum drums or aluminum parts allowed anywhere in the brake system.
Stock OEM cast iron manifold (only), with 2-1/2 inch exhaust pipe throughout.
Must exit behind driver.
Must be securely fastened under car.
No X pipes - No H pipes.
Headers are permitted under chassis – mufflers required.
50 pounds must be added.
16. WHEELS and TIRES:
Racing wheels 15 inch x 8 inch. May run any combination of 2, 3 or 4 inch offset wheels.
Hoosier 7.90 treaded tires (only).
17. FUEL CELL:
Mandatory Maximum: 22 gallons.
Must be mounted in steel container – minimum of 22-gauge steel.
Must have a 1-1/2 fuel cell loop protecting cell from being hit by other cars.
Fuel cell must have 10 inches of ground clearance.
18. SAFETY FEATURES and ROLL CAGE:
Roll cage must be constructed of (minimum) 1-3/4 inch x .095 wall round steel tubing, with full four (4) post roll cage, minimum of four (4) door bars on driver’s side, and three (3) door bars on passenger’s side that must extend out to the door skins.
Aluminum racing seat mounted to roll cage with racing seat belts (See Safety Rules0. Recommend driver’s side door bars be plated with 1/16-inch steel plate (11 gauge) or thicker.
May mount radiator directly to frame – may use round tubing for protection.
Drive shaft loops (2) are Mandatory. They are to be located 12 inches from each u-joint. Drive shaft must be painted white.
The use of mirrors are strictly prohibited.
PLEASE READ THE GENERAL RULES.
*If you have any questions regarding the rules, please email them to us!