Re: 1971 Buick Convertible
Stefano, is your Buick a big-block or small-block equipped car? M38 is typically the code for TH350; M40 is for the TH400 (am I wrong..? Could be..) Maybe during some snafu on the assembly line your car received an OW trans. If it's a small-block with the TH400, it must be a stout high-perf SB, not one of the regular ones. I dunno..interesting though.
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