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What gm motor do i have the engine casting numbers are 3970020?

The GM engine casting number 3970020 corresponds to a 350 cubic inch (5.7L) small-block Chevrolet V8 engine. This was a very common engine used across many GM vehicles over the years. However, the casting number alone doesn't tell you the exact year, modifications, or horsepower rating. You'll need additional information (like the vehicle it came from) to be more specific.
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