Both the Chevy 454 and Pontiac 455 used cast iron blocks and heads and the same 4.25-inch bore and 4.00-inch stroke. The Pontiac 455 used a cast iron intake manifold as opposed to Chevy's 454 ...

Introduced in 1970, the Chevy 454 -- affectionately known as ... Topped with a dual-plane intake manifold ready to accept your carburetor, the 454HO is capable of producing up to 438 horsepower ...