 The sportsmen at Seekonk Speedway run any stock American-made chassis made from 1970 to the late 1980s on 7 inch American Racer treaded racing slicks.The engines are 358 cubic inch General Motors and Ford engines and 366 cubic inch Chrysler engines, with the option of running a crate engine, generating ~300-350 horsepower.There is a large variety of car body styles allowed to compete, with any car body made in America from 1970 to 1988 is allowed to compete.