I have a '66 Nailhead engine that has an MT stamp on the block. Was wondering if it was a 401 or 425. The web site shows it being a 401 in one part and then a 425 in another. Does MW mean 425 or 401? Can you tell me which one it is? Thanks for your help, Casey
according to the engine ident section
http://www.buicks.net/shop/reference...ent_63_75.html
M is a 1966, and T is a 401 and W is a 425. Did you notice were the site was confusing?
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