leaky headers......

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beefovail

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If one has a problem with warped header flanges, what would be the best gaskets to use to help seal em up? I put a new set of Fel-pro on and....they didn't work real well.
It is going on a 440 with fenderwells.
 
where in AZ??

and i went with the percy's copper gaskets and they are awesome!
 
There's only one way to fix it up, and that's to take the header off, and either take it to a machine shop, and have them re-surface the flange, OR spend an afternoon with a long flat file, and a straight edge, and file it flat.. I am absolutely astonished at the finished factory flanges for being un-true.

I always check the flanges, new and used, and seldom find a set that are true.

And don't tighten the juice outa them, and re-bend them..
 
Even the best hedders will warp some over time, due to extreem heat and bolts loosening themselves up. What I do is to double gasket them and try to tighten them as evenly as possible. Then fire it up and get warmed up and retighten a little more
 
The best thing I ever did to my last two cars was cut off the header collector flanges and weld on ball and socket flanges. No gasket to blow out, and they seal great. I think I got mine from summit.
 
remflex.com


it will fix the problem for sure.

They are graphite construction and compress like no other gasket - never, ever, burn out

I had warped flanges and no gasket would last - they worked for 2 years with no problems
 
I'm in Vail. SE of Tucson.
I bought a set of Percy's Aluminum gaskets. Will report on the outcome and let everybody know the outcome. I don't have bad warp age on the flanges so these should do it. Thanks for the replies.
 
REMFLEX X2

this is the only gasket that will last with my clifford headers on my slant six. 6 thousand miles with no leak.
 
straighten the flanges out,dont bandaid it.
MrGasket ultra seals are usualy a good gasket.
 
Ok, The percy's gaskets are great! I still have a leak however. The center ports are where the leak is. I filed them as flat as I could but unfortunately the flange (at head) is tweaked pretty good. Is there a possible fix that I could do to help the situation, or is it new header time? I did read somewhere that cutting the flange between the ports may allow it to flatten out?
 
Header flanges can be greatly improved with a couple tire bars while still in the car. Bend them a little.
 
After they are established true, double up the gaskets and seal them with hi-temp RTV. Done deal.
 
Run manifolds. Never have another problem.
 
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