"R" Code heads w/ an "S" code manifold
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Junior User
Joined: Nov 2008
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From: Vancouver WA.
"R" Code heads w/ an "S" code manifold
I have a pair of '68 "R" code heads and a 65 "S" code manifold for my 390.
I noticed that the ports on the manifold are 1/4" shorter in length than the head ports.
Will this combo work, or will I end up with issues I will regret?
I noticed that the ports on the manifold are 1/4" shorter in length than the head ports.
Will this combo work, or will I end up with issues I will regret?
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
I think the smaller intake ports are normal. Later setups, like my highboy's 390 with C8 heads and edel intake, the intake ports were smaller than the head ports.
As long as the head ports are larger than the intake ports, you're OK. Some would port-match the two.
But before you do anything, wait for others here to respond.
As long as the head ports are larger than the intake ports, you're OK. Some would port-match the two.
But before you do anything, wait for others here to respond.
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Junior User
Joined: Nov 2008
Posts: 56
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From: Vancouver WA.
Thanks Art.
I looked at opening up the ports on the manifold, and it looked like I would end up with a 1/8" to 3/16" outside lip when it was done...seems a little to thin for me..but I'm not an expert on tolerances.
I will wait for more feedback..
I looked at opening up the ports on the manifold, and it looked like I would end up with a 1/8" to 3/16" outside lip when it was done...seems a little to thin for me..but I'm not an expert on tolerances.
I will wait for more feedback..
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
I'm surprised no one else has jumped on this.
If you hold an intake gasket up to the intake, and to the head, are the intake ports smaller than the head ports on all sides, or just the bottom? If it's just the bottom, I wouldn't bother doing anything, especially at only 1/4" difference. That's supposed to be that way, it keeps the intake charge moving at a good speed and it helps it to travel into the head better.
On the other hand, you could port match it. But then, it's a truck.
What gears do you have in it? 4x4?
If you hold an intake gasket up to the intake, and to the head, are the intake ports smaller than the head ports on all sides, or just the bottom? If it's just the bottom, I wouldn't bother doing anything, especially at only 1/4" difference. That's supposed to be that way, it keeps the intake charge moving at a good speed and it helps it to travel into the head better.
On the other hand, you could port match it. But then, it's a truck.
What gears do you have in it? 4x4?
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Junior User
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From: Vancouver WA.
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Cargo Master
Joined: Apr 2004
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From: Golden, CO
The intake you have is perfect for what you want to do.
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