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As part of pulling my engine, I removed my A1 muffler.  As recommended by Tiger I have been using RTV between the flanges.  In this case Ultra Copper Gasket Maker Exhaust.

I am really getting tired of cleaning off the old RTV every time I remove and replace the muffler.  Is there a gasket others are using for this joint?  A reusable gasket would be great.

My recently added vented valve covers have the hose right at the forward hanger for the muffler which makes dealing with that a little tricky.

1957 CMC (Speedster) in Ann Arbor, MI

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here is a big-flange gasket or a small-flange gasket, depending on the size of your exhaust. If you've got a 1-5/8 or smaller, it's most likely the small flange. I believe the big flange is BBC size - I know for sure that it's the same gasket all the muscle-car guys use as header collector gaskets, so those are available from Summit Racing or your local Speed Shop (assuming you still have those - we do).

Regardless, if you have the small one, lots and lots of online places sell them - I've got a copper one I picked up from CB or Appletree or somewhere. They're the same as the EMPI header gaskets.

I'd absolutely use a gasket, and I like the copper one because it can be used again and again.

Last edited by Stan Galat

Thanks again.  This looks like one of those times the shipping is more than the item.

CB Performace’s shipping calculator is funky. Yesterday I got a message that a high roof case is back in stock, so I decided to order one, just in case the TF-1 I ordered almost 2 years ago never happens. The shipping was $97.  I than added 2 more things to my cart, a Hoover bit, and cylinder heat deflectors, which are both very small. The shipping charge then went up to $136! I removed them from the cart and placed the order for just the case.

CB should send out those exhaust gaskets in an envelope for about $1, imho.

Last edited by LI-Rick

I highly recommend the copper gaskets. I've been using the same copper gaskets from cip1.com that I got in 2006. Yup, that long. They are the two-bolt style at the head. The best thing is they are slotted: you bolt it up loosely, then drop them in.MR-3388

And they seal every time so far, and I've had the motor out a half-dozen times at least.

So that's cool that they have them available for 3-bolt flanges. It will be the last one you ever have to buy.

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  • MR-3388

@Stan Galat, I guess I was too hasty.  I looked on Amazon and also Moore Parts with free shipping but didn't find the gasket.

I'll just keep telling myself that the more expensive Scat one must be better than the cheaper CB one.

It is nice that the CB illustration is dimensioned.  The bolt hole spacing seems to be about the same as what I measured.  I thought my center diameter is closer to 2" rather than the 1.6875" CB shows.

As part of pulling my engine, I removed my A1 muffler.  As recommended by Tiger I have been using RTV between the flanges.  In this case Ultra Copper Gasket Maker Exhaust.

I am really getting tired of cleaning off the old RTV every time I remove and replace the muffler.  Is there a gasket others are using for this joint?  A reusable gasket would be great.

My recently added vented valve covers have the hose right at the forward hanger for the muffler which makes dealing with that a little tricky.

When I built the Spyder exhaust I made a paper template of the flange and carried it into Pep Boys: "Hello! I need something like this in 600-degree-F-proof material."

Yes, right this way sir, we'll see if we have something on this rack-of-a-million-exhaust-flange-gaskets. . . . Ah, this looks pretty close.

And done.

I like them on my mid-engine system. You need to assemble the entire system loosely to the engine. Then I slip the 4 exhaust port gaskets in and take up the minimal slack left. The bends are so tight on the header section that you have to start the nuts and slide the system all the way on the heads as you tighten the nuts. It's weird but it works.

The point for your application isn't so much the slip-in feature, it's that the copper gaskets seal very well.

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