anyone ever flow test 383 A body manifolds say vs 383-440 hp manifolds

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ph23vo

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any differences really? ...also 68 383 A body,.. is the flow the same on both sides? or is that driver manifold less? always wondered...
 
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Highly doubt there would be much hp difference. There's been dyno comparison between hp and standard manifolds with no big differences. Same between 340/360/318 and magnum manifolds was like 5hp even shorty headers don't help much need long tube collector to make a decent difference especially once you start going with greater amounts of overlap.
 
273 said:
Highly doubt there would be much hp difference. There's been dyno comparison between hp and standard manifolds with no big differences. Same between 340/360/318 and magnum manifolds was like 5hp even shorty headers don't help much need long tube collector to make a decent difference especially once you start going with greater amounts of overlap.
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I think the old 300hp crate motor exhaust test is worthless. The cam in the stock Magnum 5.9 (which is the same in the 300hp crate motor) is so small that there were only minor differences in power between them all. But the cam was already limiting the motor so any difference the exhaust made was minor.

So I wouldn't use that test as the standard as to which exhaust manifold is the best on a 383.
 
There's a 20-30 hp difference between the restrictive A-body big block manifolds and HP version.
Chrysler Horsepower ratings show the difference.
 
DionR said:
I think the old 300hp crate motor exhaust test is worthless. The cam in the stock Magnum 5.9 (which is the same in the 300hp crate motor) is so small that there were only minor differences in power between them all. But the cam was already limiting the motor so any difference the exhaust made was minor.

So I wouldn't use that test as the standard as to which exhaust manifold is the best on a 383.
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there also a 440 with hp and standard manifolds and a few hp difference.

And yes the two small block manifold shoot outs were 300hp create engines.
 
fishmens67 said:
There's a 20-30 hp difference between the restrictive A-body big block manifolds and HP version.
Chrysler Horsepower ratings show the difference.
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those numbers could be based on test or pulled from thin air factory gross hp numbers are meaningless.
 
Not a big block guys but a close attention to the details between engine is worth the look.
 
I think as you increase hp through the manifold the b body would give up less as the hp increses. I plan on testing that theory later this summer with my 499". I'd like to do a modified c, b hp and bb a body on the engine dyno.
 
There are big differences between the 67 and 68-69 manifolds. The 67 manifolds are the most restrictive.
 
Jeremiah said:
I think as you increase hp through the manifold the b body would give up less as the hp increses. I plan on testing that theory later this summer with my 499". I'd like to do a modified c, b hp and bb a body on the engine dyno.
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Member @AndyF did some testing. Look him up.
 
Jeremiah said:
I think as you increase hp through the manifold the b body would give up less as the hp increses. I plan on testing that theory later this summer with my 499". I'd like to do a modified c, b hp and bb a body on the engine dyno.
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Are you testing with headers also?
 
Jeremiah said:
I can. I have 1-7/8 to 2" schoenfield dyno headers. They have supported close to 1000hp on a previous (n20) 511" build so no problem for the baby cam.
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That would be cool if you test the 3 manifolds against the headers.
It could be an eye opening experience.
 
Jeremiah said:
Pretty sure he would tell me to buy some headers lol. Either way you have my 2 cents above.
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While that maybe true when I’m search of maximizing power, he did do a build with exhaust manifolds. He wrote about it in a magazine. His books are very good.
 
I did a test on a stock low compression 440 making 272 horsepower with the factory log manifolds and switched to hp manifolds and gained 4 horsepower all the way up to 276HP.
 
i know headers would make more power but the car is a stock looking driver..so dont want headers..only non stock appearing items is the 69 NOS keystone KUSTOMAGS i put on it..
 
rumblefish360 said:
Member @AndyF did some testing. Look him up.
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Trust me I am sure he is familiar with my GTS project. If there was an ingrediant list to my race car it would go Chrysler corp, Indy, AR Engineering and so on.



rumblefish360 said:
While that maybe true when I’m search of maximizing power, he did do a build with exhaust manifolds. He wrote about it in a magazine. His books are very good.
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How much difference one sees between ex manifolds and headers is directly related to what the test mule combo is.

A 9.5:1 440 with pocket ported iron heads, an RPM intake and the bigger Summit cam won’t see as much difference from the addition of headers as say a 13:1 bracket race engine with TF heads/intake and a cam that’s 272/272-106.

In addition to the power the headers themselves add, there’s also the power potential that can be tapped into with a cam selection that just isn’t happy with exhaust manifolds, but can really show nice gains(compared to the exhaust manifold friendly cam) when the headers are utilized.
 
Jeremiah said:
Trust me I am sure he is familiar with my GTS project. If there was an ingrediant list to my race car it would go Chrysler corp, Indy, AR Engineering and so on.
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In bold, AndyF is. So, since the way I read this, correct me if I am wrong, if you were to talk with somebody and/or use there parts, you would speak with the above. AndyF’s company is AR Engineering.
 
rumblefish360 said:
In bold, AndyF is. So, since the way I read this, correct me if I am wrong, if you were to talk with somebody an
d/or use there parts, you would speak with the above. AndyF’s company is AR Engineering.
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I am in Oregon myself and well aware who owns AR. There is only one AR part on my GTS and I have never consulted Andy on any aspect of the project.

I have two other cars that use AR Engineering cam sync setup, jesel belt drive specific crank trigger parts, throttle linkage, spring hangers, Wilwood brake kit and several others. Both of those cars are b bodies and irrelevant to this conversation.
 
Jeremiah said:
I am in Oregon myself and well aware who owns AR. There is only one AR part on my GTS and I have never consulted Andy on any aspect of the project.

I have two other cars that use AR Engineering cam sync setup, jesel belt drive specific crank trigger parts, throttle linkage, spring hangers, Wilwood brake kit and several others. Both of those cars are b bodies and irrelevant to this conversation.
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Well OK then and thanks for not answering my question but the best of luck to you and your build.so sorry for stepping in.
 
No I haven't , buy don't expect to have any great results between the two useless hunks of iron just my opinion..lol
 
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