Thread: Exhaust flange gasket direction???

Which way does the flange gasket go on? There is an "indented" circle and I was just curious if that is supposed to face the cat or the resonator. Here are the pics:

As you can see here is the "bump out" side with the part number stamp on it.



and here is the "bump in" side without the part number stamp.



Thanks!

Technically, it shouldn't matter, as the theory behind those gaskets is that they are compressible (footprint) gaskets, but per GM Service docs, the "bump out" side is to go to the manifold, as it's the more rigid surface.

Originally Posted by 02 WS6 TA

Technically, it shouldn't matter, as the theory behind those gaskets is that they are compressible (footprint) gaskets, but per GM Service docs, the "bump out" side is to go to the manifold, as it's the more rigid surface.

So "the "bump out" side is to go to the manifold" .... towards the cat?... since that's the direction of the manifold?

this is going between the cat and the resonator on the down pipe.

....gotta make it dummy proof for the dummy installing it

Any good reason that the gasket would blow out on the bottom half?

My best guess is the flange being warped (see my pm reply) but yes, toward the thicker of the flanges. Dammit, put an LS in that thing so I can reply without thinking. LOL.

........there's a GTO for sale when I dropped in to get the gasket.... ughh, I'm too upside down to get it though

guess I'll bring out the BFH tomorrow while I got it on the lift.

hmm, not seeing a PM..

Whiskey, tango, Fox... Anyway, I just suggested trying to re-warp the flange in the opposite direction so as to preload it to combat the tendancy to horseshoe bend it when tightening it...


GTO...Dooo Ettt... :lol: I am fighting the urge to get Mel a G8 GT...

...it taunts me....


2006 Pontiac GTO 2dr Cpe Blue 2 Dr Coupe. A Pontiac GTO at Enterprise Chevrolet Enterprise AL

As I... The payment book un-taunts me however. :lol:

If I would actually get to drive it, I would talk the wife into getting it.... but I just can't justify buying something and then letting it bake in the sun for a year.... maybe when I get back.


....though, I'll test drive anything for fun

Haha, hear ya there. I'll eventually score one for her. I just like to lie to myself about my intentions.

Originally Posted by 03GTPLE

I'm just gonna use the BFH and wack the crap out of the flanges. Do you suppose there is such a thing as too far back?

Uh, Yeah, I would say there is such a thing... Try the LBFH. Or, try a 1/4" extension between the top and bottom, and gently tighten to achieve the desired warp.

I'm just gonna use the BFH and wack the crap out of the flanges. Do you suppose there is such a thing as too far back?

Originally Posted by 02 WS6 TA

Or, try a 1/4" extension between the top and bottom, and gently tighten to achieve the desired warp.

ehhh... what?

wanna swing up this way tomorrow?

"Swing up" that way? LOL Just call me when you get ready to work on it, I'll explain. hahah

yeah... guess I forgot to add the sarcastic smiley on that one...

you free around lunch? (11:30 ish)

although, I really want to know what you're tightening with the 1/4" extension... and top and bottom of what?

oh, do you mean put the extension through the bolt hole and pull on it?