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Old 11-29-2006, 09:22 PM
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what is the best header gasket?

i have the normal long tube flowtech truck headers and stock 1983 350 chevy heads on my small block 383 i cannot keep header gaskets on i've had 2 sets on in the past month they keep blowing out.......what is the best header gasket to buy???????????????????????????? this is killing me i hate changing these damn gaskets out......thnks again guys

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Old 11-29-2006, 09:54 PM
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gaskets

I have or had the same problem. I use some kind of copper gasket maybe made by mr.gasket im sure others make em. also maybe try taking em off and grinding the flanges. not smooth but try to make the ridge even it will help alot.
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Old 11-30-2006, 03:36 AM
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if that doesnt work try the percys dead soft aluminum ones they work pretty good
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Old 11-30-2006, 06:28 AM
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I bought hooker headers for my suburban engine swap, everyone told me to use copper gaskets so I bought a set of summit brand I think, there were $30. but my motor won't be in for a week or so. a buddie that has headers on 3 vehicles 2 of witch are 4x4s and he uses nothing copper and has no problems. I am in one of his vehicles every week or 2 (we hunt a lot this time of yr) and I've helped him in a couple engine swaps, so its not a storie.







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Old 11-30-2006, 06:34 AM
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These work well

Another to look at are some made by Earl's -

http://www.holley.com/types/Pressure...ader_Seals.asp

I had a sealing problem with SBF 5.0L GT40 heads and Sanderson headers and these made the combo 'work'.

Dave
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Old 11-30-2006, 06:56 AM
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The best header gasket is one that seals between two flat surfaces. If your headers are not flat, you will probably have difficulty with the sealing. I use a standard Fel-Pro gasket after I surface the header flange.
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Old 11-30-2006, 06:58 AM
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I don't use header gaskets any more, haven't for about 4 years and have had no failures on several Cobras as well as 2 428CJ Mustangs. I use Permatex High temp(copper) gasket maker. It is important that both surfaces be clean and oil free. I apply it on the header evenly but not too thick and then hand tighten the header bolts so they have some light compression on the sealant. I then allow it to set up(cure) overnight, sometimes a day or so if I'm doing other work, and then tighten the bolts to torque. It works great and eliminated the problem I had on my 351 Cleveland with having to replace one or the other gaskets every 6 months or so.
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Old 11-30-2006, 07:04 AM
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I use Summit copper gaskets. Never had a problem.
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Old 11-30-2006, 07:13 AM
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As already stated, the stock repop fel pro gaskets work great and are cheap, I`ve reused the same set 3 times over about a 5 year period. There made of metal mesh and are at your local parts store, it`s identical to the factory gasket and there difficult to burn out, another good thing is you don`t have to remove the bolt to install them, just loosen the whole header and drop them in from the top. However, here`s a few more tips, if the headers are new and the bolts are new, you have to retighten them often, every few days, other wise the bolts loosen due to them not being seasoned in. Also paper header gaskets, even so they don`t say so, are supposed to be soaked in water so they`ll swell and the moisture will help the gasket last longer.
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Old 11-30-2006, 10:38 AM
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KUHN: I fought that problem for years. I found the copper and aluminum soft metal to be the worse. They only seal on PERFECT flat surface. I use the ones from NAPA which are the FelPro type with high temp cardboard with soft metal mesh. BUT I coat them with high temp red sealant and let them sit overnight.... That has worked the best and is less costly... DAVE
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Old 11-30-2006, 11:32 AM
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hedder gaskets

i have had no problem with that flotech hedder#10500 the problem lies in 3-hard surfaces trying to compress.25 years ago in my shop i called joe(original owner mr.gasket and he suggested putting mr.g #150/a/b/c whatever in warm water tio soften it so it would compress better .hope this helps



justin.
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Old 11-30-2006, 02:48 PM
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If your exhaust ports are racing type the stock meshed metal ones can be easily trimmed to the port shape. I stack'em up and and hold em together with a small bolt and shape the inside with a die grinder. Do em all atthe same time takes only a few times. The one on my racecar right nowarthree years old and I have reused them about twenty times.
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Old 11-30-2006, 03:24 PM
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well mine headers just leak,all the time, am i losing any h p??
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Old 11-30-2006, 05:32 PM
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yes tons
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Old 11-30-2006, 06:19 PM
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so whats better the ones that came with my hooker headers (soaked in water 1st) or the summit $30 copper gaskets I bought ?




what should the header bolts be torqued to on a stock tbi 350 in a 87 suburban 4x4 ?


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