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th400 to a 501?


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The Caddy 500 engine will bolt to any Buick-Olds-Pontiac TH400. I swapped a few of these motors in the past few years and never had a problem. The Caddy 500 was used in the DeVille series cars backed up with a TH400 from the factory. That block has a lot of interchange parts(externally) with the Caddy 368 and 425 engines also.

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