Famously featured under the hood of the 1970 Chevy Chevelle SS 454, the 454 V8 is a big-block engine that helped ... ones featured in the legendary Ram Air IV, which allowed for maximum airflow ...

The Mark IV 427 engine was an iconic if not short-lived V8 engine from the 60s It got effectively superseded by the 454 which was the last great Chevy big block of the golden age of muscle cars ...