I have a line on a ZL-1 block and wasn't sure of any differences in that block and a standard 427 block, aside of it being aluminum of course. If there are any differences, I would certainly like to know what they are and also the compatibility of any standard 427 internal or external parts.
All internal parts should work. The aluminum block has extra reinforcing ribs in different locations and should have iron cylinder liners, some have bosses on the valey side of the deck for extra head bolts, otherwise the same.
'69 RS/SS396 pro street