1969 Plymouth Road Runner A12 vs 1971 Plymouth Duster 340. Factory Stock Drag Race. Pure Stock Muscle Car Drag Race.
First car is a 1969 Plymouth Road Runner. The other is a 1971 Plymouth Duster. The Road Runner is an A12, and therefore has a 440 6-bbl V8, while the Duster has a 340 V8. The 440-6 engine was rated 390 horsepower and the Duster 340 was rated 275 horsepower. Backing the Road Runner A12 is a 4-speed manual transmission, but the '71 Duster has a TorqueFlite 3-speed automatic transmission. Rear gearing in the 1969 Plymouth Road Runner A12 is 4.10. The Duster has a more aggressive set of 4.30 rear gears. Weight is a strength for the Duster as it only weighs 3230 pounds, including the driver. On the other hand, the Road Runner (with driver) is 3784 pounds. Speed and Super Car Magazine tested a 1969 Plymouth Road Runner A12, and with Ronnie Sox at the wheel it ran 12.91 seconds @ 111 mph. Super Street Cars magazine tested a 1971 Duster 340 with 3.91 rear gears and an automatic transmission and it ran 14.26 seconds @ 98.3 mph.
Remember, both cars participate in Factory Stock class through F.A.S.T drag racing. Make sure you visit their website. [ Ссылка ].
Here are the Factory Stock rules:
Rules
For 1955 to 1979 muscle cars built in United States and Canadian assembly plants with a minimum warranty of 12 months and 12,000 miles.
Drivetrain:
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.
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!
Engine:
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. Compression may be increased to the greater of NHRA allowable stock blue print or 1.5 over advertised 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.
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!
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.
Camshaft:
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.
Exhaust:
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.
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.
Suspension:
Front Suspension: Stock springs and shocks must be retained. Drag springs and shocks that allow excessive lift during launches are 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.
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.
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