Originally Posted by beertracker
Creech, I want to make sure I read this right. Do you mean Pontiac dealerships\service centers saw block #557 failures in stock engines? Or were these #557 blocks hot rodded up then failed?
HP numbers back in 77 was pretty low for a stock 400 block I believe 220 hp or so.
I don't know for sure, but I understand that the factory went back to the earlier block before production stopped in 1979.