Quote:
Originally Posted by Tom Pugh
I am installing a 455 in my '76 GTO. It will be using the Parts Place 2.25" exit HO manifolds ( Ames sells a 2.5" version but they were on backorder. I want to run 2.5" downpipes all the way back to the mufflers. Will there be a problem mating the 2.5" downpipes to the 2,25 HO manifolds or will I need to stay with 2.25 pipes all the way back?
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I used 2.5 downpipes on 2.25 manifolds
It was necessary to grind the exhaust pipe to clear the manifold studs