The Stovebolt Site Forums The Shop Area Engine Shop Exhaust Flange Requires a Gasket?

I have a 1966 C10 longbed with a 250 I6 from a 1974 vehicle. I am trying to hookup a new exhaust front pipe (Walker 48111) and was wondering if a flange donut is required with this pipe? The pipe is formed at the manifold end to look like a donut gasket and if I add a donut gasket the flange will not reach the studs as the donut makes the connection too thick. Plus, there is no flare on the pipe so the donut does not seal well there. It looks to me like I just forgo the gasket and use the pipe as is. I was just wondering if anyone else has done this.

Hy Cougar, there are flange gaskets which are flat on one side and domed on the other side, if you post the I.D. of the manifold I can provide you a Walker part number for this type of flange gasket, hope that helps.

The only numbers I see on the exhaust manifold are on the right hand side near the #6 runner. It has a large GM600 with 328 below the GM600 and 44 on the #6 runner itself. The only other numbers are on the intake. Are these the numbers you need?

Hy Cougar, what I need is the inside diameter of the exhaust manifold where the exhaust pipe attaches to it.

Here are a few pictures of the pipe and flange as well as a picture of my exhaust manifold casting numbers.

Pipe_Flange3

Pipe_Flange

Exhaust_Manifold



Inside diameter of exhaust manifold at outlet is slightly over 2" (2.02"). The edge of the outlet is beveled.

Hy Cougar, your pictures explained your situation a lot better than your description did, if your new pipe will slide up into the manifold so the formed part rests on the beveled part of the manifold, you should be good to go. You may have to tighten things up again after everything has been up to operating temerature, hope that helps.

I guess I'll try it that way and hope it seals up especially after a few heat cycles. If anyone has used this pipe this way I would appreciate knowing. Thanks!