Inliners International Forums General Discussion Hi Performance GMC 302 CNC Flanges

Does anyone make CNC intake/exhaust flanges for the GMC 302.

If not does anyone have an engineering drawing of the port design so I could get one made?

I'm looking to fabricate custom tube headers and a sheet metal intake.

Any help would be great.
Thanks,
-Mike W.-

Tom Langdon, a retired GM engineer, may have what you want; he owns the tooling for the cast iron reproduction "NICSON" headers that Phillips Performance developed. He has built tube headers in the past; the cast iron headers that he sells are of excellent quality. He'll want to sell them to you, but he might help you design your own. See the Stovebolt Engine Co. link on this site.

God's Peace to you.

d
Inliner #1450

You could also try contacting our webmaster, Tim.

I am thinking about building a set of tube headers also. One obvious thing to keep in mind is the port size will vary from stock size if you enlarge (or plan to enlarge) the intake and exhaust ports.

I have a ported head from Sissels. I plan to build a 1/8 aluminium plate pattern to match the enlarged ports and then use it to build the header plate to match.

Dear Mike;

Patrick's will know or have them for sale.

Good luck.

I used a gasket for my pattern.

Go to some of your local metal fabricators or steel shops. Some have waterjet machines or plasma cutters, I prefer waterjet, much smoother and very precise. Just make a thin cardboard pattern of the ports on your head and have them cut you out a copper gasket also.

We have a coupel shops here in town that could do that. One has a plasma cutter with a submerged arc (yes, it cuts the metal underwater, to reduce warpage) the other has a water jet cutter. Either can do it, not too expensive if it is already digitized, converting a pattern to digital is where I have run into expense.

I needed a set for my race car and had to order 10 sets before the machine shop would do them. I have one set left I will sell them for $75 and throw in the shipping in the continental US. If anybody wants pictures send me your email address.