I have a complete 454 engine out of a 1987 Suburban. This was a t.b.i. engine and ran perfectly. Has approximately 45k miles on it. Only thing missing is the throttle body, distributor, and a couple of emissions parts (was going to carb it). I actually may have the missing components for a couple extra $ if somebody wanted to go back to t.b.i. I have not had the pan off of this engine, but EVERY 87-90 t.b.i. 454 I have ever owned was a 4-bolt main and I would venture to say that this one is no different based on casting number.
