Inliners International Forums General Discussion Blown and Injected Pontiac OHC 250

All 1966 blocks have the bosses cast in, rather 1bbl or 4bbl.

From 1967 onwards for some reason or another Pontiac eliminated every other cross bolting boss. So it's on one side, but not the other. Again, didn't matter if its a 1bbl or 4bbl.

And to be clear, all the OHC engines have the 1/2" mains and head bolts.