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Re: GM Semis
Starting in ‘57, you could get a truck new from the dealership with the NAPCO conversion. (It didn’t leave the factory as a 4x4).
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'46 GMC---355,TH400, 9"
'66 K20---350, SM420, T221, D44, HO72, 4.56
'87 K30---tbi 350, TH400, NP205 twinstick, D60 powerlok, 14ff Detroit, 4.10
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