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It's CADILLAC - here's a 4-71 intake I used to own & block/head surface position. [/quote 6bblgt your right looks like it is a Caddy. Pulled up a picture of a 1953 331 intake gasket and it had the holes for I assume is a locating dowel ? Thanks for your input. I guess the C means Caddy and the CH means Chrysler.