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Re: Freeze Plugs
Tommy #1339392 Sat Dec 28 2019 01:11 AM
Joined: Feb 2004
Posts: 20,866
The rings are for alignment of the manifold to the head, and they're essential for a good gasket seal. The rings don't seal vacuum but they do allow the manifold and the head to mate at the proper position. Just measure the depth of the counterbores in both items, and adjust the thickness of the rings accordingly. "Measure twice- - - -cut once!"

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Re: Freeze Plugs
Tommy #1339398 Sat Dec 28 2019 01:51 AM
Joined: Feb 2001
Posts: 1,340
Tommy Offline OP
Shop Shark
Tom and Jerry, thanks for responding. That is what I was thinking, maybe use a sharpening stone like used for sharpening a knife. Measure the rings and take a little off of them. I'm thinking with the rings installed the manifold and head should be flush against one another.

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Re: Freeze Plugs
Tommy #1339403 Sat Dec 28 2019 02:21 AM
Joined: Jun 2011
Posts: 3,612
Shop Shark
New rings are easily made, obtain a slightly larger exhaust pipe, cut pieces off of the correct length with a cutoff tool in a lathe if possible. Slit the new rings to the correct size and install them.


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'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
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Re: Freeze Plugs
Tommy #1339510 Sun Dec 29 2019 02:06 AM
Joined: Dec 2017
Posts: 796
Shop Shark
Measure the thickness of the ring. Press the ring in the head and seat it. Measure how much is sticking out. Press the ring into the intake manifold, measure what is sticking out and subtract from the ring thickness. If what is sticking out of the head is less then you are good to go.

Last edited by Dragsix; Sun Dec 29 2019 02:07 AM.

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