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| Question about ported exhaust manifolds (Page 2/2) |
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Patrick
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MAY 26, 11:44 PM
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| quote | Originally posted by RWDPLZ:
The fact Kent Moore made a specialty tool just for that job back in the day just screams 'if it aint broke don't fix it'
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Might as well see a shot of that device being used. This was a bunch of years ago with my '86 GT. Of course, it had to be the front bank  where the two broken exhaust manifold bolts were located... which meant the cradle needed to be tipped down so I'd have some clearance to work. And yes, this is also the one Fiero of mine which has A/C, which meant the compressor was in the way.  This photo also shows a right-angle drill attachment which was absolutely required. Horrible awful job.
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RayOtton
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MAY 27, 06:47 AM
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Mickey_Moose
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MAY 27, 07:46 AM
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Not worth the trouble.
I did not notice any real difference - but I had to do mine due to it being cracked.
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cliffw
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MAY 27, 09:42 AM
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I am no expert.
It was, ... is my impression that ported heads is "the bomb". That the heads, and the intake / exhaust manifolds be ported the same. To reduce turbulence and provide smoother airflow.
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Rickady88GT
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MAY 27, 11:58 AM
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| quote | Originally posted by Cliff Pennock:
Well,I love the sound of the stock V6. If that's going to change without any gains in performance then I think I'll just leave things as they are.
About 10 years ago, I had the Edelbrock performance camshaft installed which set me back about $800 at the time. I noticed no difference in performance whatsoveer. They told me I would not notice any difference unless I also installed the ported manifolds. I always suspected I got ripped off and they never installed the performance camshaft at all.
But could that be true? That I only get a performance gain out of the camshaft if I also install the ported exhaust manifolds? |
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I agre with Patrick, that an average "Joe" will not be able to tell the difference in a gain of 10hp on a 2,300# car. I also noticed a difference in sound, but it was an improvement. And I would not do it only to swap out the manifolds in an otherwise healthy car. The risk of complications outweigh the advantages. BUT, if for some reason you do some engine work in the future, swap them out then.
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Cliff Pennock
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MAY 28, 01:47 AM
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Holy how-time-flies, Batman! I just checked and I actually got the cam in 2002... That's 18 years ago!!! 
Anyway, it's the Edelbrock 3790. Specs are:
(int/exh)
Dur @50 204*/214*
adv Dur 253*/263*
lift 420"/442"
lobe centerline 112*
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Raydar
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MAY 28, 06:24 PM
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That's a "moderate" cam. But not bad at all. It's quite similar to the Crane H-260.
.427/.454, I/E
I believe the advertised duration was 260/272.
You might be able to feel a difference. Or might not. But other mods will help to wake it up.
With all of that said, bottom line, I wouldn't bother with the exhaust manifolds unless you need to do some other, major, engine work. It would not be worth the risk.
If you have to pull the engine out for some other reason then, by all means, have at it.[This message has been edited by Raydar (edited 05-28-2020).]
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WKDFIRO
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MAY 29, 12:29 AM
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85 GT match ported upper, intermediate and lower manifolds, ported, cc'd, the heads with match ported exhaust manifolds. Mild Isky Cam with roller tip rockers. To say how much horsepower is always up for debate but the response of the engine was undeniable. There was no car that needed a 5th gear more than that 85 GT. I miss that car.
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