exhaust manifold "air" ports sealant

[clintC]

I know "welded" would be best.....is using this going to be a close 2nd

 

[Turbo4whl]

Pipe plugs do not match. What you want are inverted seat plugs.

You must be registered for see images attach

Coat the threads with some anti-seize thread paste. The inverted seat will seal the plug. They are sold by tube size, so 1/4" tube are 7/16" threads

 

[clintC]

are you saying the plugs that came with the manifold are a bad choice???? checking to see if Nappa has what you suggested

 

[Turbo4whl]

are you saying the plugs that came with the manifold are a bad choice???? checking to see if Nappa has what you suggested

Are those plugs, pipe thread? Do they have the inverted seat like the picture I posted?

 

[Turbo4whl]

Napa will have the correct plugs. Yes the people that design manifolds are engineers. The people that package the parts, not so much.

 

[clintC]

the plugs are solid w/ a flat bottom....nappa "search" didn't show anything, so I'm gonna call

 

[Turbo4whl]

Napa has them:

https://www.napaonline.com/en/p/GAT...jXDRfYlSXxJDozlG-RoCGOoQAvD_BwE&gclsrc=aw.ds&

 

[clintC]

thanx for all the info
they'll have 'em on tues

 

[75gmck25]

Many years ago I just cut each pipe and removed the fitting. Then I fit a steel ball bearing into each fitting and screwed it back in place. It was still fine when I sold the car.

 

[KnuckleBuster]

Finding a correct fitting can be a nightmare. I had some ramshead manifolds with air injection. Used solid pipe-threaded plugs. I put some anti-seize on them, screwed them in tight, and then cut them off flush with the manifold. Looks great. I should mention that I installed them backwards, screwing them in from the inside of the manifold. The threads are undamaged and they can be easily removed to allow for re-installation of AIR pipes if need be. Didn't want to damage the vintage GM parts. Good luck!