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Author Topic:   stock exhaust manifolds
OvalRocket34
Dirt Roller

Total posts: 24
posted April 08, 2002 03:20 PM
What are the best flowing stock manifolds for a small block 350? Cast numbers would help if you have them.

Thanks

malibuchevy2
Dirt Full Roller

Total posts: 43
posted April 08, 2002 05:11 PM
manifold off a late model gm 89 and up truck

millerlt3
Dirt Forum Racer

Total posts: 96
posted April 08, 2002 08:32 PM
They are difficult to find but work great, early model corvette center dumps.

phelps
Dirt Full Roller

Total posts: 58
posted April 08, 2002 08:57 PM
P.A.W. has the 2 1/2 center dumps

EVANSRACING24E
Dirt Forum Racer

Total posts: 80
posted April 09, 2002 12:48 AM
the center dumps are called rams horns and they can also be found on 60 and early 70s trucks.

EVANSRACING24E
Dirt Forum Racer

Total posts: 80
posted April 09, 2002 12:49 AM
the center dumps are called rams horns and they can also be found on 60 and early 70s trucks.

Machinah
Dirt Forum Racer

Total posts: 79
posted April 09, 2002 05:23 AM
Ram horns are right as far as I know. They are still restrictive but suposedly the best that GM made. I didn't know that they used some on trucks (makes sense), but there were several on the Corvettes as stated above. Might be expensive even through salvage.

WesternAuto17
Dirt Freak

Total posts: 248
posted April 09, 2002 08:42 AM
I had a '69 3/4 ton GMC with a 350 that had them.

#37DG
Dirt Roller

Total posts: 10
posted April 09, 2002 08:49 AM
quote:
Originally posted by WesternAuto17:
I had a '69 3/4 ton GMC with a 350 that had them.

You don't want the pick up truck manifolds they are corker 2" versions. THe ones you want are off a late 60's corvette that are 2 and a half inch. Go to your local GM parts dealer and order them brand new for a hundred dollar bill a peice. YOu will never go back to anything else untill you get those babies, everyone at my track runs them and loves them. Its about a 30 horsepower gain over 2" ramhorns. go to this web site read and learn. www.castheads.com

Mountit
Dirt Newbie

Total posts: 3
posted April 09, 2002 12:36 PM
I will be running the WISSOTA streetstock class and we cannot run center dump manifords. The newer (88-95)style pickup fuel injection manifolds seem to be the ticket up here. My question is which will flow the best, the log style, the ones where the front three flow back and the forth port flows slightly forward, or the ones where they dump up instead of down?

WesternAuto17
Dirt Freak

Total posts: 248
posted April 09, 2002 02:48 PM
I'm all for saving money, but making headers illegal costs the racer more money.

I guess restricting headers keeps you from spending money on the intake side, but still, what a goofy rule.

OvalRocket34
Dirt Roller

Total posts: 24
posted April 09, 2002 02:58 PM
Our tech guy assisted in writing the rules this year and he wanted to add headers. the problem was the sanctioning body believed there were already enough changes made and didn't want to make any more. Maybe next year, that and the Holley carb might be on the way.

As far as the manfolds are concerned, Our track doesn't allow the center dumps. I have a set of the truck manifolds, however they won't bolt up to the heads. I drilled them out and i'm still about 5/16 off on the last set of holes on both sides. Could the manifolds have warped during the off season? It's getting down to crunch time and i have to find something, basically this week, to get on the car to get it done. Practice sessions start this friday!

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