According to Pete McCarthy's book, there were only two pontiac engines available in a '77 GP. A 170hp, 4bbl, 350, and a 180hp, 4bbl, 400. Block codes for the 350 were YA or YB, for the 400 YU or Y4.
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Bill
64 GTO, tube chassis w/606" IA tall deck, PG & a pro geared Fab 9". 2750 lbs.
[email protected]/4, [email protected]/8, 1.1981-60-ft. 8/10/08
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