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Thanks zieg85 , but it's a 2 bolt main. Edit: or does the"4" you listed stand for four barrel?
So what I have been told is that if the second 7 is a Z then it would be K= GMC, 7=1977 and Z =Fremont Ca plant. And as far as it being a 77 or 79, the casting date is October 18, 76 so 77 would have to be the build date.Thanks for the input everyone!