Exhaust manifold Fit
Thread Starter
Drifting
Joined: Jul 2007
Posts: 1,889
Likes: 23
From: Kansas
Exhaust manifold Fit
On a 1980 Vette, with 2005 Vortex, 350 Cube engine, I had to grind off a set of 1980 G.M. 2" C.I. manifolds, in order for them to bolt on the Heads. If I installed, a set of 1963, 300 H.P., 2 1/2 " G.M. C.I. manifolds, Would you have to Modify them, or would they fit at all??? Thanks, I Appreciate, The Help. Gene
Burning Brakes
Joined: Nov 2000
Posts: 813
Likes: 2
From: da up
I don't know if this tidbit will help you or not.
but, I know a guy who put vortec heads on a '78 and he used the original '78 exhaust manafolds with no problem, iirc he removed the heat riser plate as the vortec doesn't have the crossover passage.
edit , I'm thinking pre "LS " series engines
but, I know a guy who put vortec heads on a '78 and he used the original '78 exhaust manafolds with no problem, iirc he removed the heat riser plate as the vortec doesn't have the crossover passage.
edit , I'm thinking pre "LS " series engines
Last edited by yooperod; Aug 15, 2009 at 11:29 AM.
Thread Starter
Drifting
Joined: Jul 2007
Posts: 1,889
Likes: 23
From: Kansas
Thanks for the answer. I'm doing that now, using 1980 manifolds, but I had to grind the small casting mounts, off the back of them to make them fit. (4) Now I want to increase the flow by using the 2 1/2 " off of an 300 H.P. 1963. Have a great one. Gene
Burning Brakes
Joined: Nov 2000
Posts: 813
Likes: 2
From: da up
nope, have Iron eagles on a 365/327 block
vortec's were on my buddies 78. his ramhorns went right on
I don't recall any grinding , care runs nice , peppy , mild cam , automatic
Rod
edit,to add info
vortec's were on my buddies 78. his ramhorns went right on
I don't recall any grinding , care runs nice , peppy , mild cam , automatic
Rod
edit,to add info
Last edited by yooperod; Aug 15, 2009 at 12:25 PM.
