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Old 04-28-2007, 01:40 PM   #1
ninethreeeleven
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Default Because OT gives answers quicker. Exhaust Question

Is the internal diameter of a 3" exhaust gasket actually 2 3/4" or is that a 2 3/4" exhaust gasket?

Can't find out anywhere on google.

More specifically, is a 3" exhaust gasket actually 3"s (internally?).

Also:
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Old 04-28-2007, 01:45 PM   #2
RP31
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Seems to me like it's 3". My 3" ID exhaust is not overlapped by the 3" gasket I put on it.
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Old 04-28-2007, 01:48 PM   #3
ninethreeeleven
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Originally Posted by RP31 View Post
Seems to me like it's 3". My 3" ID exhaust is not overlapped by the 3" gasket I put on it.
I just measured my exhaust and it's tough to measure but the opening (exact) opening is 3"s but if you look inside it's really thicker and around 2 3/4".

I went to NAPA and they had 2 3/4" gaskets, but no 3", nothing in 3". That's when we measured the internal space. Is there a 2 3/4" exhaust on other cars? I never bothered to look it up.

I guess I have to order them, can't find them anywhere locally.
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Old 04-28-2007, 02:13 PM   #4
ninethreeeleven
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Anyone have any other opinions?
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Old 04-28-2007, 02:38 PM   #5
tcs007
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Quote:
Originally Posted by ninethreeeleven View Post
Anyone have any other opinions?
The picture you posted is interesting.
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Old 04-28-2007, 02:40 PM   #6
teiva-boy
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3" pipe is never really 3" pipe, as most times it's measured from the OD, and not the ID. So best thing to do is just measure the ID, and get a gasket to match.

Napa has a book where you can just match your old gasket to a template, to give you part numbers to what you need
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Old 04-28-2007, 03:41 PM   #7
ninethreeeleven
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Originally Posted by teiva-boy View Post
3" pipe is never really 3" pipe, as most times it's measured from the OD, and not the ID. So best thing to do is just measure the ID, and get a gasket to match.

Napa has a book where you can just match your old gasket to a template, to give you part numbers to what you need
Found 3" (internal diameter) gaskets at Advanced Auto Parts. Seems to be Factory for some old GM dump truck or something.

Thanks though.

Also, The exact face of the exhaust is 3", but just inside it's not really 3" that's why port & polish businesses stay in business I guess.
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