Exhaust gaskets?

« **on:** September 07, 2014, 08:07:59 AM »

Yesterday I burnt up my exhaust manifold gaskets. It and Olds 455 with logs what type of gasket should I use..... stock oem car manifold gasket, header gasket or copper. The price really isn't an issue I just don't want to keep changing gaskets

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« **Reply #1 on:** September 07, 2014, 08:18:42 AM »

I use remflex gaskets never had a leak awesome product

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« **Reply #2 on:** September 07, 2014, 08:32:00 AM »

I haven't run exhaust gaskets on a boat in years. I use high temp silicone. Check your manifolds, if they are excessively warped, you'll never get them to seal.

« **Reply #3 on:** September 07, 2014, 08:48:25 AM »

The manifolds do not appear to be warped it has the oem style gasket with divided center port but the logs do not have divided center ports .

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« **Reply #4 on:** September 07, 2014, 08:50:25 AM »

My thought was it started burning the divided center port part of the gasket

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« **Reply #5 on:** September 07, 2014, 09:09:37 AM »

I'd clean them good and throw a straight edge across them just to verify they're not bowed. Then use a quality high temp silicone like Permetex. Do a bead around each port, let it stand 5 or 10 minutes before installing them. Then let them dry for 24 hours before starting the motor. See if that doesn't seal better.

« **Reply #6 on:** September 07, 2014, 09:16:26 AM »

Ok thanks ill have to give that try

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« **Reply #7 on:** September 10, 2014, 02:31:30 PM »

Quote from: icecreaman on September 07, 2014, 09:09:37 AM

I'd clean them good and throw a straight edge across them just to verify they're not bowed. Then use a quality high temp silicone like Permetex. Do a bead around each port, let it stand 5 or 10 minutes before installing them. Then let them dry for 24 hours before starting the motor. See if that doesn't seal better.

X2 - check for being warped - especially since you've changed them 2x already

JW

« **Reply #8 on:** September 10, 2014, 02:59:41 PM »

X3. I never use exhaust manifold gaskets. I use the Permatex Ultra Copper stuff.

Olds manifolds are notorious for warping the center manifold flanges/ports because of the siamese port. See the attached photo of some clamp-on blocks I made to eliminate this problem. They were pretty easy to make using just a drill press and a metal-cutting bandsaw.

« **Reply #9 on:** September 10, 2014, 03:07:32 PM »

This will be the first time I've had to change them but who knows how many times the Po did. Maybe it time for headers this winter

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