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If you face the engine look at where the left cylinder head & block meet, early and late 70s blocks have a part of the engine block that sticks out and usually is behind the alternator. It sticks out about one inch and is about five inches long. 80s blocks only have about one inch out and is about two inches long. There will be numbers and then three letters such as cha. What these will tell you is hp, torque, automatic or standard shift...

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Q: How can you identify a small block Chevrolet engine's year and horsepower by the code numbers on the block?
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