Thread: Crazy Pontiac question

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Originally Posted by techinspector1

Use minimum 3/8". If I ever build another set, I'll use 1/2".

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Amen to that, that way after all the warping you can swing it by the machine shop and have them surfaced back to flat and still end up with some thick flanges again!

Ok, can do! I have a machining and welding class this semester, it shouldn't take terribly long to knock out a set of flanges.

Say, do any of you techo wizards have a drawing of the ports and bolt holes?

My idea was to template it using metal foil tape.

I did a pattern once by taping a piece of poster board on the block, tapping around the exhaust ports and bolt holes with a brass hammer to embed a pattern, and cutting it out with an Xacto knife.

Why not use an exhaust manifold gasket to lay it out?

Originally Posted by 36 sedan

Why not use an exhaust manifold gasket to lay it out?

Doh! *Smacks head like Homer Simpson* Manifold gaskets are still available on Summit, among other places. CLICK HERE

That's so crazy it just might work

Originally Posted by Henry Rifle

I did a pattern once by taping a piece of poster board on the block, tapping around the exhaust ports and bolt holes with a brass hammer to embed a pattern, and cutting it out with an Xacto knife.

Same way I have done it, thin cardboard, like a cereal box and light taps with a ball of a ball pien hammer, it will actually cut the carboard into a gasket if you go over it enough, gaskets sometimes aren't always exact (Chevy guys know as there where so many port variations) might have to screw it down through two bolt holes to keep it from moving.

I've always had good luck starting with a gasket, using tape to match the ports on the gasket to the head. Once adjusted its easy to transfer the modified gasket to template whatever you need.

You could put a couple of layers of masking tape across the area and the use a scalpel to cut the holes out. Peel the tape off and stick it to the plate and transfer the pattern. This way the pattern doesn't move around on you.

Make sure the surfaces are really clean of oil and you are good to go.

That's fairly what I had in mind, but with foil duct tape. I'm not sure I can get enough precision with that method, to satisfy my shop instructor.

0142 DIM - Schoenfeld Headers

I usually buy gaskets from Schoenfeld and send them to StainlessHeaders to have custom flanges made from 3/8 stainless

http://www.schoenfeldheaders.com/upl...341879.jpg?853