Interested in knowing what you guys used to plug the air rail holes In your stock exhaust manifold?  I used some galvanized plugs in my manifold that is now leaking.  Will be replacing that manifold and looking for other suggestions. 

some changes make whistling sounds.

I had a Z where the PO just sawed off the main rail of the air gallery and crimped the ends.  Another car I owned had it removed, plugs left in place and the holes plug welded.  The latter looked much better.

I used brass plugs and screwed them in. 

3 hours ago, DatsunZGuy said:

I had a Z where the PO just sawed off the main rail of the air gallery and crimped the ends.  Another car I owned had it removed, plugs left in place and the holes plug welded.  The latter looked much better.

I did a hybrid of above.  I cut the tubes, pinched them closed and welded the pinch together.

Galvanized plugs are pretty hard and won't seal as well as something softer like brass

https://zcardepot.com/collections/exhaust/products/exhaust-manifold-air-smog-pipe-plug-240z-260z
 

They sell plugs here. 
 

MSA ceramic coated headers did the job for me, followed up with 2.5" exhaust. badabing.

https://www.thezstore.com/page/TZS/PROD/classic19d/15-6012CH

Me too!  Love the sound.  Bada boom. 

Edited February 28, 20206 yr by siteunseen

7 hours ago, w3wilkes said:

MSA ceramic coated headers did the job for me, followed up with 2.5" exhaust. badabing.

https://www.thezstore.com/page/TZS/PROD/classic19d/15-6012CH

Yea, keeping this car as close to original as possible. Have a header on my other Z

Similar to others, cut off the plugs, welded shut and and ground down all of the metal inside of the runner that was obstructing the exhaust flow.

 

Thanks all, I didn’t want to damage my air galley rail, as you can see from the pic it’s a perfect piece and has been replated.  I chose to get the plugs from Z Car Depot.