Beyond the general rules all classes follow, these are the Flathead and Inline specific class rules.
The Flathead and Inline Class is an engine specific class. The diversity in vehicles allowed ni their class makes it one of the most interesting classes in the VDRA.
New members have one race season in which to make the necessary adjustments and alteration to a vehicle in order for the vehicle to pass flathead and inline class tech. Failure to do so will disqualify the vehicle until the adjustments or alterations are made. Reinstatement of a vehicle that has failed to meet class rules will be by the Race Master once vehicle passes inspection.
All Vehicles must meet NHRA safety requirements for speed and ET
All vehicles must pass a track inspection before competing
Permitted vehicles include the following: Hot Rods, Gassers, Roadsters, Altereds, Front Engine Dragsters, Rear Engine Dragsters, and Factory Production vehicles pre-1972
Race Master has full discretion in determining if a vehicle is qualified to compete or not
Suspension and Drivetrain:
NO air, electronic or timer devices are allowed in the operation of shifting the vehicle. Must be shifted by Driver.
Transbrake and line lock ARE allowed
Any transmission is allowed.
Flathead engines permitted: Straight 4-6-8 cylinder and V-8 engine block configurations. Ardun and Aluminum heads are permitted.
Inline engines permitted: Straight 4-6-8 cylinder engine block configurations. Must be a pushrod driven engine. No Overhead cam configurations permitted. Aluminum , Wayne and specialty cylinder heads permitted.
Any ignition system is allowed. Magneto, Points, Transistorized or MSD as example.
No Data Recording devices allowed.
Rev limiters are permitted only for the preservation of the engine. They will not be allowed to control the launch of the vehicle or any down track tuning
No delay boxes or crossover boxes permitted.
No throttle stops permitted
Only roots style superchargers up to 8-71 are permitted. Turbo chargers are permitted.
Any intake manifold is permitted Bird and Bug catcher hats are permitted.
Carburetor and mechanical fuel injection ONLY. Electronic Fuel Injection will NOT be permitted.
Nitrous Oxide in not permitted
Gas and Methanol fuels permitted. NO Nitromethane permitted
Antifreeze or any coolants other than water are not permitted.