2017 RRCS PURE STOCK RULES
1. CARS: Minimum wheelbase of 100 inches. No trucks, vans, or convertibles of any type. All bodies, steering parts,
bumpers, transmissions and frames must remain stock O.E.M. and in stock locations unless otherwise specified. No addon parts allowed unless specified. No trucks allowed except El Camino and Ranchero.
1.1. BODIES: Front and rear firewalls and floorboards must remain stock with all holes covered. Door skins and quarter
panels may be replaced with stock O.E.M. or sheet metal of the same thickness and must conform to the body and
must remain stock in appearance. All upholstery must be removed from the car. Wheel wells may be cut out and
rounded. Rear trunk floor on full-frame cars may be removed. Closing in of passenger-side compartment allowed
(cockpits). All window openings must remain open.
2. TIRE SIZE: Maximum tire size 275-60 series radial tires only. No off-road, recaps, or snow tires allowed. Used Hoosier
racing tires allowed; can be grooved and siped. No new tires allowed. DOT – All-season M&S tires allowed. No M&S
truck tires unless all-season radials. No defacing of any tires. Steel rims only: 8 inches max. Oversized wheel studs and
nuts recommended: max 5/8 inch stud. No rims with bead locks allowed. Tread must measure 7/32 or less in one of the
grooves, as marked in the picture below (Figure 1). One-inch wheel spacers allowed; must have 5/8 wheel studs to use
wheel spacers.
3. BRAKES: Four wheel working stock O.E.M. brakes are mandatory. All four must lock up and they will be checked at the
track. No adjustable brake bias valves.
3.1 DIFFERENTIALS: Stock passenger rear ends only. GM with GM, Ford with Ford, Chrysler with Chrysler. No moving
mounts to fit. Differentials may be locked or welded. O.E.M. for that make of car. Any stock gear ratio allowed for
make of vehicle. No traction control devices. If not a factory/stock part that came with the differential for the
make and model of car you are racing, after-market C-clip eliminators are not allowed. Ford 9” rear axle/rear end
is not allowed unless it comes stock or was an option for the make and model you are racing. At the 2016 RRCS
drivers’ meeting, a 3-year freeze on the Ford 9” was decided upon and this therefore includes the 2017 and 2018
race seasons. This will be reviewed by the class rep in coordination with the RRCS Tech Inspector for upcoming
seasons.
4. ALL ENGINES: 8-cylinder naturally-aspirated engines. 400ci max. Entire engine must remain O.E.M. stock unless
otherwise specified. Only GM motor allowed in GM, Ford in Ford, etc. NO MODIFICATIONS TO ENHANCE HORSEPOWER.
Air conditioning, alternator, pollution devices, and heater may be removed. No engine setback allowed. Engine must
remain in stock O.E.M. location. No racing or high performance parts allowed unless specified. 1¼” carburetor adaptor
plate may be used. Distance from intake to base of carb must not exceed 1¾”. One 2-barrel carb only: O.E.M. for make
of motor. Choke may be removed: no other work allowed. No Holley (4412), 500 CFM or 600CFM carbs. Flat top or
dished pistons only. Pistons cannot go past top of block. Maximum camshaft lift intake/exhaust is .450 inches including
stock rocker ratio. Hydraulic cams only. No roller rocker/lifters. No aluminum intakes, heads or blocks. Cast iron exhaust
manifolds only. No center dumps or factory tuned manifold. No LT1 manifolds. Exhaust must exit under vehicle. Stocktype ignition system for that make of car. No performance ignition parts. Must remain stock for make of engine. Max
overbore .060. Max 9.5 compression. Oil pan must have inspection hole that can be accessed and removed at the track.
4.1 SMALL BLOCK CHEVY: 327ci + must use a cylinder head with a minimum of 72cc, 1-cc tolerance. No centre hole
(valve cover) heads e.g. Vortex.
4.2 SMALL BLOCK FORD: 351ci+ must use a cylinder head with a minimum of 60cc. 1-cc tolerance. No Boss heads.
4.3 SMALL BLOCK CHRYSLER: 360ci + use a cylinder head with a minimum of 72cc, 1-cc tolerance. No magnum heads.
4.4 COOLING SYSTEM: Belt-drive water pumps only. Any radiator in stock location. Mechanical fans only. No electric
cooling fans allowed.
5. TRANSMISSIONS: Stock-type automatic transmissions only: GM with GM; Ford with Ford, Chrysler with Chrysler. No
standard transmissions allowed. No power glides allowed. No in-and-out transmissions allowed. Stock-type torque
converters only, with a minimum of 10” in diameter. Car must be able to idle in gear (1000 RPM or less). No torque
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converter lock-ups. All ranges must work (e.g. Park, Reverse, Drive, 2 , 1 ). Any size trans cooler allowed. Cooler must
be mounted away from driver as to not spray on driver if ruptured.
6. CRASH BARS: No front or rear crash bars. All bars must remain within the perimeter of the frame (except door bars).
Bars allowed in front of the rad must be flush. 1” tolerance. No front or rear bars past the end of the frame. No rub
rails. No excessive bars.
6.1 BUMPERS: Front and rear stock bumper mounts may be replaced with a 4 inch or 6 inch .125 square tubing
mounted at a right angle to frame. Maximum length=6 inches: bolted or welded. No sharp edges. Racing nose
cones may be used with fabricated bumpers. Fabricated bumpers to be made out of the same round tubing as roll
cage with max of two horizontal bars. Bars must be rounded at ends to avoid piercing though the sides of other
cars. Must be mounted like stock bumper. (Speedway Motors part number: 910-54721 as reference.)
7. WINDSHIELDS: Windshields must be removed and either a heavy gauge screen or a minimum of 4 ¼” bars are to be
mounted in front of the driver in the windshield opening. No mirrors allowed.
8. ROLL CAGE: Steel tubing for roll cage must be at least .095 inch (1.565 on micrometer) wall and 1.66 minimum outside
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diameter. No pipe fitting or galvanized tubing allowed. Must have a 3/16 inspection hole in a non-critical area. Roll
cage must conform to interior. Driver’s head cannot extend past top of roll cage. ROLL CAGE DIAGRAM IS NOW THE
MINIMUM REQUIRED: A 4 or 6 point frame mounted roll cage is mandatory and must have one main rollover
continuous hoop to extend from the frame up to the roof, across and back down to the opposite side frame. Two bars
from top of the main hoop, going forward, bent (approx. 30 degrees) at the top of front window and (approx. 60
degrees) at the bottom of the window, continuing to front frame (both sides). All other cross bars to be gusseted and
butt welded (see Figure 2 below). Minimum of 3 Torso or Kidney bars made of the same material standards as
previously listed, must be welded horizontally and equally spaced between window opening and lower door jam. These
bars must be welded to the roll cage with ¼ inch gussets along the inside of the driver’s door. Roof bar, front window
bar and front corner posts required. All bars must tie into frame with gussets. Full size uni-body cars must use a
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minimum 12 inch x 1/8 inch square floor plate bolted or welded to floor (for roll cage). Mid-sized uni-body cars must
use sub-frame connector; minimum .125 square tubing. Full frame cars may replace rear frame rail from center of diff
back with .125 square tubing: in stock location. Any other frame repair must use .125 wall metal. All doors must be
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bolted, chained or welded shut. All cars equipped with a sun roof must cover sun roof opening with a 1/8 inch steel
plate.
9. BATTERY: Mandatory approved shut off/disconnect in reach of the driver. Battery either mounted in front passenger
floor area or trunk area in a marine battery case only and securely mounted with a hold-down strap (e.g.: seat belt)
10. FUEL SYSTEMS: Pump gasoline only; no racing fuel. Max 10% ethanol enriched. No nitro, alcohol or additives allowed.
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Fuel cells are mandatory. Mechanical fuel pumps only, no electric fuel pumps allowed. Max 3/8 inch steel fuel line
recommended inside the car. No excessive fuel line or size. NO FILLER SPOTS ON FUEL TANKS.
11. HOOD: There may be a hole in the hood directly above the carburetor. No hood scoops, but a hood deflector is allowed.
12. SHOCKS: Only one (1) shock per wheel stock mounted in stock location. No coil-overs allowed. No adjustable shocks.
13. WEIGHT RULE: Minimum 3200 pounds (lbs) with driver after the race. (No allowance for missing body parts.) All cars
that cannot meet the 3200lbs rule may add weight mounted anywhere on the car with a minimum ½” diameter bolts.
Make sure they are secure and don’t fall off as the car is weighed with driver (minus any missing bumpers, body, etc)
after the race. Weight must be painted white and have car number on it.
NOTE: TRACK OFFICIALS RESERVE THE RIGHT TO REFUSE ANY CAR IF IT IS NOT WITHIN THE ORIGINAL CONCEPT OR
RULES OF THIS CLASS.
Figure 1
Figure 2
SAFETY RULES
1. DRIVE SHAFT: Must be painted white and have a front continuous loop around drive shaft within 6 inches of the front
universal joint. Loop must be made out of steel at least ¼ inches think by 2 inches wide. No chains.
2. STEERING COLUMN: Steering column must be collapsible. After-market steering columns allowed but must have a slipjoint or a double U-joint. No solid shafts allowed. Quick-disconnect steering wheels are allowed.
3. SEAT BELTS: Minimum 5-point racing harness mandatory: tight and worn at all times including if your car is stopped. Do
not undo your belts until instructed by an official. Belts will be inspected for age/wear/condition. Max three (3) years
old.
4. RACE SEATS: Approved racing seat and window net REQUIRED. Race seat mounted securely to roll cage at 4 points,
welded or bolted. Full containment seat – not mandatory but strongly recommended and may become mandatory at
RRCS in the near future.
5. FIRE SUITS: An approved single-layer Nomex/fire-resistant suit is mandatory. Two-layer/multi-layer Nomex/fire-resistant
suit is not mandatory but highly recommended. Nomex/fire-resistant gloves and shoes – not mandatory but highly
recommended.
6. HELMETS: 2010 Snell-approved full-face helmet or newer is mandatory. Helmets will be inspected for
age/wear/condition. Note: Tear- offs should be used on visors (for mud, and they require a special mounting system).
Head/Neck Restraint - HANS or similar device is currently not mandatory with RRCS however it is strongly
recommended and may become mandatory in the near future.
7. FIRE EXTINGUISHER: There must be one readily available in your pit area.
NOTE: Racing belts, helmets, seats, window nets and fire suits are cheap insurance and can be taken from car to car. It
pays to get good equipment. For better protection in the cockpit, it is recommended that you add door plates,
floor plates and extra window bars to keep yourself protected.