What engines were the Chevrolet iron rams horn exhaust manifolds used on?

Chevrolet's "iron ram's horn" exhaust manifolds were used on a variety of small-block V8 engines, primarily the 283 cubic inch and 327 cubic inch engines. They were also found on some 350 cubic inch small-blocks, though less commonly as later 350s often used different manifolds. The exact years of application varied depending on the specific engine and vehicle. Pinpointing the exact years without knowing the specific engine code is difficult.