Strange 3946074 ( ZL-1 & L-88 ) heads

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Strange 3946074 ( ZL-1 & L-88 ) heads

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03-17-2007, 06:36 PM

jerry j jerry j is offline

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Re: Strange 3946074 ( ZL-1 & L-88 ) heads

Hi, When GM cast the first batch of D port ex port heads they had the 074 casting #, the part # was different than the 074 round port casting part # a few months after they changed the casting # to 077. I had some of these D port 074s when new, I think around 1980.
Jerry

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