Intake Manifold Plugs

[Nate Hanson]

Hey guys, Im looking for some stainless steel intake manifold plugs, that flush mount..this is for my SBC that I'm working on..any suggestions?

[GregWeld]

Remember -- PIPE sizes are measured by SUBTRACTING 1/4" from the observed measurement -- so if you measure some "pipe size" as 1/2" -- it's 1/4" pipe. 3/4" observed - would be 1/2" pipe and so on.

Here's a link to Summit Racing - order 'em up buddy!



http://www.summitracing.com/search/Department/Fittings-Hoses/Brand/Performance-Stainless-Steel/Product-Line/Performance-Stainless-Steel-Plugs/?autoview=SKU

[camcojb]

Remember -- PIPE sizes are measured by SUBTRACTING 1/4" from the observed measurement -- so if you measure some "pipe size" as 1/2" -- it's 1/4" pipe. 3/4" observed - would be 1/2" pipe and so on.

Here's a link to Summit Racing - order 'em up buddy!



http://www.summitracing.com/search/Department/Fittings-Hoses/Brand/Performance-Stainless-Steel/Product-Line/Performance-Stainless-Steel-Plugs/?autoview=SKU
I think he's looking for some that will mount flush with the manifold. I've had a few that did, but that was just a combination of circumstances and tolerances, probably wasn't meant to do that. Being that pipe threads generally taper they will almost never end up flush with the hole they thread into.

The ones of mine that did end up flush I figured that the threads weren't correct, not tapered. There have been cases where I could have continued tightening them until they fell through the hole................... :willy: However, with sealer they still worked, just didn't tighten up as normal, you had to stop tightening them when flush and let the sealer dry fully before use.

Jody

[GregWeld]

These (the link posted) would be as "flush" as a guy is going to get - end of story.

If you tighten these enough to actually be flush - you've probably cracked the manifold, or stripped the threads... and the sealant is needed but also actually makes these little suckers slippery (teflon sealant) and it's easy to "over tighten"...

Jody is right - NPT (National Pipe Thread) is TAPERED so is supposed to tighten up...

[camcojb]

I guess a guy could run a pipe tap through the threads of the manifold and see if you could open them up a little; standard pipe taps are tapered also so it's possible that you could experiment and get it to be flush as it tightens......... that assumes that your tap goes wider than the threads already in the manifold so it could cut them larger. You'd want to test fit the plug first, open the threads a bit more, test fit, and so on.

Jody

[GregWeld]

Jody -- Your builds show your attention to detail.... :rofl:


I'd thread them in - then chuck the manifold in my mill and end mill them to within .010" - then I'd pull them out and polish them 'til they looked like chrome.... :willy: :wow:

[Vegas69]

I agree Jody, if they are sticking out you can cut the threads a little deeper. Personally, I don't think it's worth the trouble. Use some quality plugs and don't make a mess with pipe dope and it will look fine.

[camcojb]

Jody -- Your builds show your attention to detail.... :rofl:


I'd thread them in - then chuck the manifold in my mill and end mill them to within .010" - then I'd pull them out and polish them 'til they looked like chrome.... :willy: :wow:
my only question at this point would be if there was enough (or any) of the allen plug left after milling to be able to use a tool to remove and re-install the plug. Would work perfect if there was.