This is a V8RRS-only class for cars that are similar to the GTA stock cars but have higher horsepower and no specified tire rules. Some of the cars will have up to 800 hp, but all must run on tires that fit on a NASCAR-style 15” rim and use a blade spoiler instead of the larger wings found on the GT1 or GT2 cars. This class is mainly populated by ex-NASCAR (both Cup and Busch/Nationwide/Xfinity) and ARCA cars plus higher horsepower Late Model stock cars.
GTSC (Stock Car) Class Rules
Late Model/SWT type cars and GTA/ASA/USAR type cars
1. Any commercially available or competitor built, mild steel stock car chassis with a minimum wheelbase of 101” and a maximum wheelbase of 110” may be used. Chrome alloy chassis are not allowed.
2. Maximum track width is 65 inches.
3. The minimum overall height (measured 10 inches behind at the top of the windshield) is 46.5 inches.
4. The minimum ground clearance for any part of the chassis or bodywork rearward of the front tires (with all tires inflated to a maximum of 25 psi) is 4.0 inches.
5. The minimum ground clearance for the front air dam (with all tires inflated to a maximum of 25 psi) is 3.0 inches.
6. The maximum front bumper/body width is 80.0 inches.
7. 1990 through current-year commercially available stock car composite bodywork. ABC type or straight up commercially available Late Model bodies as built by FIVESTAR, ARP, etc.
8. The types of bodies allowed are:
• Chevrolet Impala / Monte Carlo / SS
• Dodge Charger / Intrepid
• Ford Fusion / Taurus / Thunderbird
• Oldsmobile Cutlass
• Cadillac CTS
• Lincoln MKS
• Toyota Camry
• 2010+ Chevrolet Camaro, Ford Mustang, Dodge Challenger
9. Flat blade spoilers only, period correct for series car ran (no Spliters, Louvers, or Wings)
10. The bottom of the car must not be “belly-panned” or flush paneled. Panning may not extend rearward of the trailing edge of the radiator or be wider than the radiator. Other than ductwork that serves no other purpose than to direct cooling air to the brakes, fuel/air metering device (carburetor or throttle body), and/or driver, no fixed or moveable air-directing devices are permitted underneath or inside the car.
Suspension/Shock Absorber Specifications:
1. Springs are open.
2. The steering wheel must be mechanically coupled to the front wheels and activate only those wheels (no “steer by wire” or “four-wheel steering”). Power assist is allowed and may be driven off the differential.
3. A collapsible steering column, either by layout design or column construction, is required.
4. Front lower control arms must be made of steel. Upper control arms, strut arms and upper pivot shafts may be aluminium. Coil Over suspension is allowed.
5. Spindles must be steel and designed for racing applications.
6. Independent front suspension with articulated upper and lower control arms is mandatory.
7. Major steering components including steering arms, tie rods, idlers, etc., must be fabricated from approved ferrous or non-ferrous alloys. All heim joints must be of aircraft quality.
8. Sway (anti-roll) bars must be made of steel. Heim joints are allowed to be attached to the lower control arm(s) and/or rear end. Driver adjustable sway bars are allowed.
9. The longitudinal linking system for the rear of the chassis may not exceed four locations and may not include a “torque tube” of any design. Spring-loaded and/or cushioned (torque absorbing) links are permitted.
10. Either a panhard bar or Watts link may be used to locate the rear axle laterally.
11. Independent rear suspensions are not allowed.
12. Any auto racing commercially available shock is allowed, with only one shock per wheel allowed. Canister type aluminium body shocks OK, i.e.: PENSKE, OHLINS, etc.
Rear End Specifications:
1. Ford 9” or Quick Change units only. No “rear drive” or modified driven Quick Change rear ends are allowed, live axle rear end only (no independent rear suspension).
2. The maximum rear camber per wheel is +/- 1.75 degrees.
3. Electronic and/or electronic/hydraulic traction control devices are not allowed.
Wheel and Tire Specifications:
1. Wheels must be 15”x10” steel stock car rims of a one-piece construction specifically for racing, min. weight is 20 pounds.
2. Tires to be stock car type for 15” X 10” rims. Soaking or chemical treating of the tires is prohibited.
Transmission and Driveshaft Specifications:
1. Transmissions must be readily available stockcar-style technology with four forward gears and an operating, driver engageable reverse, i.e. JERICO, TEX, RANKIN, MID VALLEY, RICHMOND , EMCO type. Manual “H-style” shift linkage is required.
2. No five-speed, semi-automatic or automatic transmissions allowed. No sequential shift mechanisms are allowed. Ceramic bearings are not allowed.
3. Steel driveshafts only.
1. All vehicles must use dual master cylinder, 4-wheel disc brake systems.
2. Driver adjustable brake bias is allowed.
3. Brake rotors must be iron.
4. Brake recirculators are allowed.
5. Any commercially available brake caliper (i.e. AP, WILWOOD, BREMBO, ALCON, PF, etc.) may be used subject to:
• Up to Six Piston caliper in front
• Four Piston caliper in rear
6. Inline blowers may be used in the brake cooling ducts, but water cooling of the brakes is not allowed.
7. Electronically controlled anti-lock braking systems are not allowed.
8. Brake pad materials are open.
1. All engines will be normally aspirated, pushrod V-8s. SBC 18 degree, 23 degree, LS Series, and current conventional SLM GM, Fords and Dodges allowed.
2. Engine setback will be measured from the center of the front most spark plug hole to the centerline of the top ball joints. For Late Model/SWT cars the maximum setback is 4.00 inches. For GTA/ASA/USAR cars the maximum setback is 2.00 inches.
3. A minimum of 10.0 inches, measured from the center of the crankshaft bolt to the ground, must be maintained at all times (with all tires inflated to a maximum of 25 psi).
4. Aftermarket cast iron engine blocks are allowed, but must be equal to or greater in weight and exterior dimensions compared to the original manufacturer of the same make and model. Aluminum blocks only with LS series engines.
5. The crankshaft must be made of steel or iron. The stroke may be increased or decreased. min. allowable weight is 38 pounds. Lightweight, knife-edge, 180-degree, pendulum cut, scalloped, and/or undercut counterweight crankshafts are allowed
6. Connecting rods must be solid steel. No titanium, aluminium, stainless steel or composite rods are allowed. Rods may be tested by using a magnet.
7. Valve covers are open.
8. Alternators must be OEM type, belt driven, and are optional. One-wire alternators are permitted and may be driven off the engine or the differential.
9. Water pumps must be OEM type. Water pump impellers may be altered for improved cooling.
10. The accelerator pedal must be mechanically coupled to the fuel/air metering device (no “fly by wire” throttles).
11. Maximum of one Holley type 4150 carburetor allowed.
Minimum Weights (after any on-track session):
1. The base minimum weight for a car with driver:
• Up to 366 c.i. – 2800 pounds
• 367-383 c.i. – 2900 pounds
• 384 c.i. and over – 3100 pounds
2. GMPP 602 crate motor: 2600# with driver, alternate camshaft allowed.
3. GMPP 604 crate motor: 2600# with driver as produced.
4. LS1 or LS6 stock type short block, unported heads, ASA hot cam allowed
2600 lbs with driver. These engines are allowed one 4150 Holley carburetor up to 750 cfm or LS motors may utilize stock unmodified factory fuel injection system.
1. Late Model/SWT type cars and GTA/ASA/USAR type cars are to be run in their original series configuration. No modification allowed unless specified in the rules above.
2. Late Model/SWT type cars and GTA/ASA/USAR type cars are spec to be in the 650hp range for their weight.
3. SB2 Chevy or other recent NASCAR CUP type motored cars will be classed in GT1 or SPO if utilized in the Late Model/SWT or GTA/ASA/USAR type chassis. For GTSC these recent NASCAR CUP type motors are allowed only in the “former NASCAR Cup, Busch, Nationwide/XFinity, Truck Series, East-West, ARCA, Hooters Cup type vehicles” (see rules below). These cars run at a heaver weight with heaver wheels.
4. Unless it is specified in the rules, it is not allowed.
Former NASCAR Cup, Busch, Nationwide/XFinity, Truck Series, East-West, ARCA, Hooters Cup type vehicles (including Dash/ISCAR with V8 engines):
1. Minimum base weight is 3300 pounds with driver after the race when using recent cup type engines. 3200 # with driver after race for 18-23 degree type, Hooters spec Chevy/Ford/ Chrysler type engines.
Chevy: RO7, SB2, 18 Degree, 23 Degree.
Ford: FR9, D-3, C-3. Dodge: R5P7.
Toyota: Phase 14, Phase 9.
362 c.i. max. allowed on all above engines
Fuel Injection allowed on RO7, FR9 and Phase 14, all others must be carborated
2B Spec Engines;
ARCA Ilmor 396
396 c.i. mas allowed on above engine
Must run Holley EFI system in ARCA rule book
3. 4 speed transmissions only, Jerico, Tex etc.
4. 9 inch or quick change rear ends only.
5. Steel driveshafts only.
6. Minimum ride height is 4".
7. 15x9.5 cup wheels stock car type wheels as raced in their respective series only, minimum weight (each) is 26 pounds.
8. Blade spoiler only, period correct for respective series car ran (no wings, Splitters, under trays). COT Cup cars can run period correct splitter and wing.
9. Tires to be stock car type for 15” X 10” rims. Soaking or chemical treating of the tires is prohibited.
10. Wheelbase as raced in the respective series.
11. Body dimensions as raced in respective series. Replacement bodies allowed.
12. Dash/ISCAR (with V8 motor) type cars, use the “Late Model/SWT type cars and GTA/ASA/USAR type cars” rules above for:
• Rear End
• Wheel and Tire
• Transmission and Driveshaft
1. Former NASCAR Cup, Busch, Nationwide/XFinity, Truck Series, East-West, ARCA, Hooters Cup type vehicles (including Dash/ISCAR with V8 engines) are to be run in their original series configuration. No modification allowed unless specified in the rules above.
2. Unless it is specified in the rules, it is not allowed.