I have a very complete excellent running t.b.i. 454 engine out of my 1988 GMC crew cab pickup. This engine is totally complete, fan to flexplate-t.b.i. to pan. Ran excellent and has right at 90K original miles. I have not had the pan off of this engine, but EVERY t.b.i. 454 from 87-90 that I've ever owned has been a 4-bolt main and I have no reason to believe that this one is any different. $1000
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