Dan a 3999290 block was used in 1972 in passenger, Chevelle and Camaro cars. Its really a 402 CID engine with a 2 bolt main rated at 240 horse. Not really rare or worth much unless someone is restoring a 72 and wants the correct block number.
396
How rare are the 396s? Found one says 1972 chevelle or monte 396????? Just wondering if its a motor worth snagging
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I just worked on a 72 Monte with a 402 in it. The code was CLB which the owner who bought the car new said was the original engine.
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