The Factory Stock rules used at F.A.S.T. events include any car that meets the Pure Stock Musclecar Drag Race (PSMCDR) Rules.

Click here to check out the PSMCDR website

Cars built from 1975 - 1979 that are eligible for the PSMCDR are only eligible to run in out Modern Muscle Class at the NPD FAST Spring Nationals. 

All entries must follow the intent or spirit of the F.S. rules. However, there may come a time when a participant misinterprets the F.S intent.

In all instances, the F.S coordinator will make the final interpretation on the rules. Due to the overwhelming number of correct* car and engine combinations, and due to the fact that many parts are no longer available, if you believe that you have a valid reason why your car could not follow the letter of the following rules, contact the rule coordinator for a decision.


For 1955 to 1974 muscle cars built in United States and Canadian assembly plants with a minimum warranty of 12 months and 12,000 miles. Factory lightweight cars built for sanctioned drag racing and dealership-built/modified cars are not eligible to participate. Cars must be factory equipped with a minimum of four-barrel carburetion, dual exhaust, and other factory-installed equipment that promotes a high-performance intent and image. Cars are paired up based on time trial e.t.s and compete in a best-of-three heads-up shootout.


The original appearance must be maintained. No after-market panels of any kind are allowed. No "custom" paint colors, designs, or lettering are allowed. The car must maintain the stock ride-height. Raising or lowering either the front or the back of the car is not allowed. The car must have a presentable appearance. No primered areas, mismatched paint, or large rust-holes allowed. Bumpers must retain all original bracing and reinforcements. Inner fender panels, front and rear, must be retained. Factory hood scoops, ram air, and fresh air induction must be correct for the year, make, and horsepower claimed. No after-market or homemade induction units of any kind are allowed. The factory air cleaner assembly must be retained and in place during all runs. No after-market air cleaners allowed. Interior seating, trim, and materials must be correct for the year and model claimed. After-market tachometers and gauges are allowed if mounted on he steering column or under the dash, except for some factory tachs mounted on top of the dashboard. OEM glass only. All windows must be functional and closed during all runs.


Automatic Transmissions: The transmission and torque converter must be correct for the year, make, and horsepower claimed. Shift improver kits are allowed. After-market shifters are not allowed. No manual valve bodies. No lightweight internal components allowed.
Manual Transmissions: The transmission must be correct for the year, make, and horsepower claimed. 3-speeds may be upgraded to the correct 4-speed if originally available. after-market H-pattern shifters are allowed if no modifications to the floorpan are necessary. Line locks are not allowed. Scattershields are okay.

Rear Axles: 

The rear axle must be of the same manufacturer as the car. Any gear ratio is allowed. Driveshaft safety loops are mandatory on all cars 13.99 and faster!


Must be factory correct for the year, model, and horsepower claimed. Dealer installed engines and dealer performed engine modifications are not allowed. Casting numbers must be correct for the year and horsepower claimed including intake manifold, heads, and exhaust manifolds. Modifications are prohibited. Blocks do not have to be "numbers-matching," but they must be the correct displacement. Overbores up to .070" are allowed. Stock cranks only. NO strokers! Random P&G checks are possible. No lightweight cranks, connecting rods, or pistons allowed. Aftermarket pistons are allowed, but piston rings can be no thinner than 1/16", 1/16", and 3/16" for top, second, and oil rings, respectively. Gas porting of pistons NOT allowed. Metric and pressure-back-type rings (dykes, head land, etc.) are NOT allowed. Torque straps allowed. Torque straps are allowed. No after-market blocks allowed. Compression may be increased to the greater of NHRA allowable stock blue print or 1.5 over advertized compression. NHRA

Electrical System:

The battery must be retained in the original location and securely fastened down with the original style hold down. The charging system must be fully operational at all times. The removal of the alternator belt is not allowed. Lightweight batteries are NOT allowed. 

Fuel System and Carburetor: 

The carburetor must be correct for the year, make, and horsepower claimed. Jetting and metering changes are permitted. THE CHOKE ASSEMBLY MUST BE IN PLACE AND FUNCTIONAL! Mechanical secondary carburetors cannot be substituted if vacuum operated units were original to the car. Mechanical fuel pumps must be retained. Electric fuel pumps are NOT allowed. No fuel pressure gauges are allowed. Factory fuel lines are required. No rubber lines allowed unless originally equipped as such. 


All pulleys must be factory issue, and they must have the correct diameters for the year and horsepower claimed for the engine. Belts running the water pump, alternator, and power steering must be retained at all times. Air conditioning belts may be removed if they do not affect other components.

Valve Train:

The complete valve train must be factory stock for the year, make, and horsepower claimed. Rocker arm ratio must be correct for the year and horsepower claimed. Roller tip rockers allowed as long as correct ratio is used. No full-roller rocker arms allowed. Random requests for valve cover removal WILL happen. Poly-lock type adjustable nuts, jam (crimp) nuts, and adjustable pushrods are allowed. Valve covers must be correct for the make, year, and horsepower claimed. 


The camshaft must be correct for the model, year, and horsepower claimed for duration, lift, and type of lifter (hydraulic or solid). No roller cams allowed. Engines must be able to produce 16.0 inches of vacuum at 1200 rpm. However, certain factory-produced engines were not able to generate 16.0 inches of vacuum in showroom condition, so those cars will be given a variance to the rule. 


Cast iron exhaust manifolds are mandatory and must be correct for the year, model, and horsepower claimed. NO internal modifications to the exhaust manifolds are allowed. Under no circumstances will headers be allowed, including those cars that came with headers delivered in the trunk. The exhaust system may be upgraded to a maximum of 2.5-inch head and tail pipes. Pipes must be routed as they were originally for the year, make, model, and engine combination. Mufflers must be stock-looking in design, that is, oval in shape. No glasspacks or straight-through pipes allowed unless installed as original equipment. Maximum muffler inlet and outlet size is 2.5 inches.

Ignition System:

 The ignition system must be stock, including the distributor, cap, coil, and wires. Points may be replaced with any electronic conversion that fits under the stock distributor cap. Replacement coils are allowed as long as they are the correct shape, color, and size. Coils must be mounted in the correct location with correct brackets for the make, year, and engine combination. Ignition boxes are allowed as long as they are completely hidden and are not used for a traction device. Spark plug wires must be of correct appearance in size and color for the vehicle. 

Cooling System: 

The radiator must be correct for the year, make, model, and horsepower claimed. No lightweight, aluminum radiators allowed. Overflow catch cans of at least 16 ounces are required. Radiator shrouds must be correct for the application. The fan must be factory original and correct for the year, model, and horsepower claimed. No after-market "lightweight" flex-fans allowed.


Front Suspension: Stock springs and shocks must be retained. Drag springs and shocks that allow excessive lift during launches are NOT allowed. The front sway bar must be retained, and it must be functional at all times. Raising or lowering of the front end is not allowed.
Rear Suspension: Traction devices are limited to hop-stop bars for the upper control arms on coil-spring cars. Pinion snubbers and clamping of springs are allowed on leaf-spring cars. No slapper bars or ladder bars of any kind are allowed unless originally equipped at the factory. Factory documentation will be required to prove authenticity for any car equipped with bolt-on traction devices. No dealer-installed traction devices allowed. After-market upper and lower control arms for coil spring cars are not allowed. Raising or lowering of the rear end is not allowed. 

Tires & Wheels: 

Reproduction tires or radial tires only. No soft compound tires of any kind allowed. Retread tires are not allowed. Use of traction compounds or rubber-softening chemicals on tires are strictly prohibited. Tire size must approximate what was originally installed on the car. All four tires must be the same size. No 60-series tires will be allowed unless they were originally available for the car's year and model. 60-series tires must be run on 15-inch rims as they were originally. Cars built before the introduction of 70-series Polyglas or Wide-Ovals are allowed to upgrade to 70-series tires of appropriate size for the car. Please call for clarification. Suspicious tires will be durometered. Factory wheels only. Wheels must be correct in size, offset, and style for the car's make, model, and year. All four wheels must be the same size and offset.


Drivers must wear long pants. Cars 13.99 and quicker must have an approved Snell 2000 helmet! Batteries must be secured down. All cars must have seatbelts for the driver. All wheelstuds must be present and lugnuts tight. Radiators must have an overflow catch can of at least 16 ounces. All accessory belts MUST be in place and tight to operate the water pump, alternator and power steering (A/C belt may be removed). Cars 13.99 and quicker must have a driveshaft safety loop! We highly recommend carrying a fire extinguisher in your car at all times. No passengers allowed in participating vehicles.

Attention: Please Read

1. No passengers allowed in participating vehicles.
2. Wristbands for drivers mandatory.
3. Guest driver cards mandatory.
4. If you run faster than 3/10 during shoot-outs, you forfeit the shoot-out.
5. No more working on vehicles in the pits after the scheduled time of closing. We will be locking the gates. If you need to work on vehicles, please do so outside the gate or back at the hotel.
6. Air cleaners must be on engine during time trials and shoot-outs.
Any questions or concerns, e-mail us.
Deviations to any of the rules are grounds for disqualification, unless backed up with authentic factory documentation.

all questions should be emailed to