Discussion Starter · #1 ·
I ran into a deal locally for a late 80's GM crate 454 for a great price. My question is does anyone here have any experience with or know the specs on one of these? It's a Mark IV engine and it has the original aluminum intake and valve covers on it. I'm guessing it's the same engine that Chevy put in the 1990 model Chevy SS454 pickups because it looks exactly like one. Do these have the oval port heads on them or are they like the newer crate 454's and have the rectangular ports? Any help appreciated!