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How to Identify a Chevy 400 Small Block


The 1970s were a tough decade for performance engines, with rising fuel prices and emissions regulations. It seemed that the muscle-car era was over. In 1970, Chevrolet introduced the 400-cubic-inch small-block engine into this environment, offering it for truck and large passenger car use. Although there were no high-performance editions of the 400, it is currently popular to rebuild and customize the 400 for high-performance applications, partially due to its availability and price. The Chevrolet 400 was produced from 1970 to 1980, and identifying it is a matter of locating and referencing the engine code suffix.

Step 1

Open the hood and view the engine from the front on the passenger side.