Speedway Division (1952)

ENGINE

Block: American-made passenger car or approved truck
Displacement: No limit
Bore: within limits of blocks used
Camshaft: any type allowed
Crankshaft: stock crank and stroke for series and model engine
Intake manifold: any type, limit 2 carbs
Carburetors: any type, air cleaner optional
Cylinder head: must be stock, catalogued. Compression ratio may be altered.
Ignition: must be battery distributor type
Pistons: must be engine manufacturer's stock
Exhaust manifold: any type manifold header
Water pump: Impellers may be altered
Valve lifters: any type Spark plugs: any type
Generator: stock or none
Starter: any type starting devices, either integral or separate unit;
no pushing or towing allowed.
Radiator: Any size core or expansion tanks. Radiator must not alter body shape of car.

SPECSs

DIMENSIONS
Wheelbase: minimum of 96 ½ inches
Tread: minimum of 53 inches
Weight- important: total dry weight of complete car must not be less than 6 ½ pounds per cubic inch of engine displacement.
Premium pump gasoline must be used

• Special type racing frame, no stock allowed
• One or two man Indianapolis racing body type only
• Racing type wheels only (Rudge, wire or magnesium)
• Stock or special steering but subject to appeal
• 4 brakes any type but must lock wheels