304 exhaust question - JeepForum.com

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post #1 of 8 Old 07-04-2003, 11:47 AM Thread Starter
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304 exhaust question

I have just replaced my 304 in my CJ-7. I have a problem. I can not keep exhaust from leaking at the header gaskets. All of my bolts are tight. I have tried one gasket, and I have tried to double them up. I still have a bad leak. I am using the gaskets that came in my felpro gasket kit for the engine. Do I need to invest in better gaskets?

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post #2 of 8 Old 07-05-2003, 05:58 PM
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It may sound silly, but what shape are your motor mounts in? Are they sagging in any way? If so this will keep the headers from sitting exactly square and thus you will constantly burn gaskets. I had this problem also and the new mounts are what fixed it.

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post #3 of 8 Old 07-06-2003, 06:05 PM Thread Starter
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Both of my motor mounts are brand new. I changed them when I put my new engine in.
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post #4 of 8 Old 07-06-2003, 06:43 PM
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try putting rtv ultra copper on both sides of the gaskets

1978 cj-7 had since 1979
401 .030 over- full floating flat top pistons
crower solid cam 292 dur .500/.510 lift
turbo 400 tranny 2500 stall
model 20 transfer case
aj delux glass body
4" lift
dana 30 frount
dana 44 rear
4.56 gears
13.461 @ 92.45 mph on 37" super swampers on 1/4 mile
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post #5 of 8 Old 07-07-2003, 06:56 PM
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You might also try the Mr. Gasket "Ultra-Seal" brand of header gaskets. they are made from some kind of graphite and hold up very well. Also pull the headers and check the flange surface with a strait-edge. they may be warped a little.

'85 CJ-7, fuelie '73 401, NV 4500, Atlas III 4.3, 14 bolt FF rear, Dana 60 front, full width axles, Detroits F&R, 4 wheel discs, spring over front, coils and reverse 4link rear, 100 in wheelbase, 42 inch Swampers on hummer beadlocks.
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post #6 of 8 Old 07-07-2003, 07:08 PM
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I had the same problem when I had my 304. Upon the suggestion of a racing friend I did a "redneck" surface grind on my manifolds - basically ground them flat by putting them face down on my garage floor and moving them in a figure 8 pattern until they were flat. I then assembled the exhaust with no gaskets and had no further issues with them - I was skeptical but I'm a believer now.
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post #7 of 8 Old 07-07-2003, 07:20 PM
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I saw a coupling once, in a magazine, that was flexible and replaced about 6 inches of pipe.

I am sorry that I don't remember where I saw it but there is something out there that will assist you in your quest for a leak free header flange.



Do it right the first time !
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post #8 of 8 Old 07-08-2003, 12:06 PM Thread Starter
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Thanks for the advice. I am going to try a copper gasket to see if it helps.
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