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Wally -
I've been following this thread with great interest. Over the holidays I picked up some parts in a trade, including a forged steel crank represented as coming from a '66 L72 427-425. After spending some time with my "Chevrolet By The Numbers" book, I concluded the 6223 casting number so clearly visible after I purchased the crank (and apparently invisible before that point) indicated it was from a 65-69 396. The book noted that a 396 crankshaft's third counterweight is 3/4" thick, while that of a 427 is 7/8". Mine is 3/4".
Could this crank actually be from a 427? Could a 396 crank be safely used in a 427, in spite the lower rotating mass? Would this cause a balance problem or possibly shorten the life of the engine?
I had planned to sell the 6223 and buy an aftermarket unit with a slightly longer stroke to increase displacement.
Mike (33053)
I've been following this thread with great interest. Over the holidays I picked up some parts in a trade, including a forged steel crank represented as coming from a '66 L72 427-425. After spending some time with my "Chevrolet By The Numbers" book, I concluded the 6223 casting number so clearly visible after I purchased the crank (and apparently invisible before that point) indicated it was from a 65-69 396. The book noted that a 396 crankshaft's third counterweight is 3/4" thick, while that of a 427 is 7/8". Mine is 3/4".
Could this crank actually be from a 427? Could a 396 crank be safely used in a 427, in spite the lower rotating mass? Would this cause a balance problem or possibly shorten the life of the engine?
I had planned to sell the 6223 and buy an aftermarket unit with a slightly longer stroke to increase displacement.
Mike (33053)
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