1975 Pontiac 455 exhaust manifold
#1
Member
Posts like a V-Tak
Thread Starter
Join Date: Mar 2007
Posts: 44
Likes: 0
Received 0 Likes
on
0 Posts
1975 Pontiac 455 exhaust manifold
I have a 75 Grandville with a 455. I am looking for an exhaust manifold. I understand the pontiac 455 block is the same as all the other large V8'* (350 and up). I assume that an exhaust manifold for any of these engines would fit. Does anyone know if the manifold from a Firebird of Lemans would also fit?
#2
Senior Member
Posts like a Northstar
It'* not the block you need to be concerned about, it is the heads since the manifold bolts to the head and not the block. And most of the Pontiac V8s used the same exhaust manifold flange. What won't work is 301/265 or round port manifolds. Otherwise what you have heard is correct for the most part, that the Pontiac V8s all share a similar overall engine design. There are subtle differences between blocks of different displacements but most of them can interchange most of their parts.
As long as it is a D-port flange, it will bolt up to the engine fine but the outlet may be pointed wrong for the frame in your car. As long as the outlet comes out in the same place on both the old and new manifolds, you're golden.
As long as it is a D-port flange, it will bolt up to the engine fine but the outlet may be pointed wrong for the frame in your car. As long as the outlet comes out in the same place on both the old and new manifolds, you're golden.
Thread
Thread Starter
Forum
Replies
Last Post
nemo9512
Classics (Star Chief and 1957 to 1986)
1
08-18-2011 08:25 PM
wyckedcombo17
Classics (Star Chief and 1957 to 1986)
2
06-16-2010 01:18 PM
acg_ssei
Classics (Star Chief and 1957 to 1986)
3
02-25-2004 10:17 AM