Bronson Speedway
2013 Pure Stock Rules
ALL VEHICLES
1. Any 1970 or newer American sedan with minimum 101? wheelbase allowed. Minimum weight 3200 lbs, after race-with driver (FUEL MAY NOT BE ADDED). Leaf spring cars must weigh minimum 3300 lbs, after race-with driver. Maximum 53% left side weight at all times.
BODY
1. Cars must be strictly stock for year, make, and model.
2. All flammable interior pieces must be removed. No cutting of any metal interior panels allowed.
3. Doors may be gutted to allow for roll cage only. Minimum of (4) bars on driver's side, and (3) bars on passenger side.
4. All exterior trim must be removed.
5. Inner front fender panels may be removed.
6. Hood must have minimum (2) hood pins in front, and (2) hood pins in rear if hinges are not used. No holes in hood. Hood must retain stock configuration (no hood scoops).
7. Complete floor and firewall must be retained.
8. Fenders may be trimmed for tire clearance.
9. All side and rear glass must be removed. All window posts must remain as manufactured and in stock location. No side windows of any kind.
10. Factory front windshield must be used, or may be replaced with minimum 1/8? Lexan with support braces ( no screens permitted).
11. Stock front grill plastic must be removed. Aftermarket nose piece may be used to replace stock front grill. Nose piece must fit over stock bumper.
12. All cars must have a 4? number on top right (pass. side) of windshield, for line up purposes. Door and roof numbers should be clearly visible to scorers.
CHASSIS AND SUSPENSION
1. OEM suspension front and rear for year, make, and model.
2. Camber shims may be added, but must utilize factory length control arm bolts. Strut cars may slot upper mounts for camber adjustment.
3. Coil Springs must be stock spring for model of car.
NO RACING SPRINGS PERMITTED.4. May run any OEM brand of shocks on all 4 corners. NO RACING STYLE SHOCKS (ie. Bilstien, Carrera, Koni)
ENGINE
1. Stock for make and model. GM-350, Mopar-360, Ford-351Maximum cubic inches. Maximum overbore is .060. No small block 400 C.I. engines.
2. All cylinder head combustion chambers may not be smaller than 73 cc. No high compression heads allowed.
3. Absolutely NO grinding of any engine components.
4. Stock 2 or 4 barrel intake manifolds only.
5. Any factory stock 2 or 4 barrel carburetor allowed. May NOT be altered in any way. No plastic or glass fuel filters. Unaltered box stock Holley replacement 500 CFM 2 barrel (PN #4412) permitted, with maximum one-inch manifold adapter.
6. Screw in studs and poly locks permitted. Stock rocker arms and rocker arm ratio only.
7. Any valve cover with breather permitted.
8. Stock replacement flat top or OEM flat top piston only.
9. 3? tall x 14? round maximum paper air cleaner permitted. No air boxes.
10. All internal components not to exceed factory OEM specifications.
11. Stock OEM Crankshaft or aftermarket OEM crankshaft kit (claimer) may be used. Crankshaft minimum weight is 53lbs.
12.Engine must pull a minimum of 17? vacuum at 1,000 RPM
13.No advancing or retarding of camshaft timing.
14. NO chaining, strapping or tying down of engines permitted. Engine must remain in stock location with factory mounts.
15. NO porting, polishing, painting or grinding of internal engine components except for oil return holes in heads or block for better oil return only. NOTE: Engines must remain strictly stock as produced by manufacturer. No modifications of any kind, unless otherwise noted in these rules (no high performance engines).
IGNITION
1. 12 volt battery fired ignition only.
2. OEM Distributor and Ignition only.
3. No locking or altering of distributor.
4. No HIGH PERFORMANCE Ignition Modules.
5. No HIGH PERFORMANCE Ignition Coils.
6. Alternators are okay.
DRIVE TRAIN
1. Rear end must be stock for make and model of car. Welded rear, stock posi traction, or mini spool permitted. No torque sensing rear differentials allowed.
2. Stock automatic transmission with all working gears. Factory type transmission mount only.
3. Standard transmission permitted but must add 100 lbs. Stock flywheel and OEM style clutch only. Blow proof bell housing required.
4. 10? minimum diameter working torque converter
EXHAUST
1. Stock OEM cast iron manifolds only. No center dump exhaust manifolds.
2. Exhaust pipe must exit to side of car and behind driver.
3. Maximum exhaust diameter at the manifold = 2 inches. Must be maximum 2 1/2 inches at exhaust pipe.
FUEL SYSTEM
1. Maximum 22 gallon fuel cell mandatory. Trunk floor may be removed to install fuel cell. Fuel cell must be in approved steel container and centered between the frame rails.
2. Fuel cell tip over/flapper valve required.
3. Minimum 8? ground clearance at all times.
4. Protection bar behind fuel cell required (Minimum 1-1/2? x .095? roll cage tubing).
5. Minimum of (2) 1/8? thick x 1? wide steel straps surrounding entire fuel cell, located to left and right side of gas filler, is required.
6. Fuel cell must be bolted securely (No rivets or screws).
BRAKES
1. Stock OEM 4 wheel working brakes only. No brake bias devices of any kind.
2. All four brakes must be working.
WHEELS AND TIRES
1. 8? width maximum steel wheels only. Racing wheels recommended.
2. Minimum 7/16? wheel studs with 1? lug nuts on all four corners.
3. Tires must be DOT 70 series radial. Any offset (tire stagger) is acceptable. NO LT, trailer, truck or racing tires permitted
4. NO chemical treatment or soaking of tires.
REMEMBER, IF THE RULE BOOK DOES NOT SPECIFICALLY ADDRESS SOMETHING, IT IS ILLEGAL.
A printable version of these rules is available HERE.
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