- Moderator
- #1
vetteboy86
Well-known member
My boss was wondering if his 427 was a 2 or 4 bolt main engine. My initial feeling is that it is a 4 bolt because I thought they went from 4 to 2 sometime in the mid 70's. I cannot be sure though. The motor has the 4 barrel carb instead of the 3x2 so is that the 390 hp version.