I am mocking up some parts on my '64 project truck right now and would like to use the set of ported/jet-hot 2000 coated F-body exhaust manifolds to feed my turbo. The engine and turbo will consist of a 408 with WCCH Edelbrock 245 heads and an Airwerks S-85 or S-88 turbo.

I am looking for a 1000 rwhp potential, so give me your opinions on the upside down F-body manifolds in this set-up. There is one runner that looks rather small that I have a picture of, it is probably 1"x1.5". The positives for these manifolds is the Jet-hot coating and they are cnc'd round where they meet the head (and at the collector flange I believe), so no restriction there. My next option would be to build a set of log manifolds like Parish did. I am not sure of my skills (or budget) to build a set of 4 into 1 tubular headers. All opinions welcome, enjoy the pics!

 

I don't have any useful information to share with you other than HOLY CRAP!

 

Is that an O2 bung in a stack manifold? Good spot for a EGT probe. I think how you get the exhaust from the otherside will be more important than port size. More boost is just a tolerence away with a turbo right?

"stack manifold"

 

Henry, the biggest restriction is not gonna be the turbo anyways right? Unless those are serverly undersized which they don't "look" to be, I would think that they would work well. You figure out what your gonna go with yet?

 

With my 408 and a rear kit, the stock manifolds built up too much pressure and heat. That's why I had my little engine fire on the dyno after three pulls... Of course, I wasn't using a turbine the size of Montana either

If you want to use then, I'd get 'em fully worked to flow enough cfm to keep from causing excessive heat and pressure problems.

 

One word: Extrude hone.

 

What is that?

 

Taken from wikipedia:

"...is a very precise and economical method of smoothing and polishing internal surfaces and producing controlled radii. The process is particularly useful for difficult to reach internal passages, bends, cavities, and edges. The AFM process uses a specially formulated abrasive laden polymer, hydraulically forced over, or through, areas requiring finishing. The unique properties of the polymer (called Media) permit it to flow through passages and conform to the shape requiring finishing."

So in a nutshell, you shoot an abrasive through the manifold and in doing so it removes material off the walls and makes the runner bigger. It's been done for years where manifolds and max performance are required. I think he'll be able to hit 1000rwhp without doing this though.

 

Hey thanks man. Kinda feel stupid for not looking it up myself!

 

EXTRUDE HONE is a bitchen process, however it can get pricey. You might want to research making your own tubular manifolds.