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Truth be told, I never removed a heat riser valve. I do know there are sleeves that the shaft rotates in. It looks like the kit may not supply those. Hopefully someone else can give you guidance. I think that shaft is just punched out.

Here’s a company in Canada that sells the complete kit. I don’t know if individual parts are available but search Classic Industries, Mega Parts or Google. National Mo-Parts – Est. 1987

So, on my first try, I did find brass plugs, 1/4” NC, to fit the brass sleeves. I started tapping the one side of the exhaust manifold through the brass sleeve and on one of the last turns with the tap the brass sleeve spun out. Ooops! I removed the other brass sleeve, as some folks here told me...

I’m going the tapping route. Thanks again!

I know those are hard to come by now a days. I thought a little bit about it but don’t think their needed.

Did you tap the brass sleeves or remove them and tap the metal?

Both of those methods are what I’ve heard is good. Since I don’t really weld I was thinking the Allen plugs would work. Thanks for the replies @#41 and @4vnut

As shown in the picture the valve and all the parts are gone. Is tapping threads for plugs a good solution?

Somewhere Fluidfilm was mentioned as a good option to preserve the bare metal look. Or am I mistaken?

I can add these photos of a Sono X-6 muffler dated 10-64. No country of manufacturing is seen. It came from a C-body guy. I have wondered what model it’s from and if the rust could be eliminated. Good Day!