Re: Best way to avoid water leaks on the ends of HEMI heads?
[Re: domingo]
#2491090
05/02/18 08:38 PM
05/02/18 08:38 PM
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Joined: Jan 2003
Posts: 7,477 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,477
Minnesota
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Hylomar is good stuff. Are you using steel shim or copper head gaskets? with a good composition gasket, it shouldn't leak.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Best way to avoid water leaks on the ends of HEMI heads?
[Re: domingo]
#2491119
05/02/18 09:50 PM
05/02/18 09:50 PM
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Superfreak
Unregistered
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Superfreak
Unregistered
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Do you use Hylomar in conjunction with the head gaskets?
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Re: Best way to avoid water leaks on the ends of HEMI heads?
[Re: 71birdJ68]
#2491138
05/02/18 10:24 PM
05/02/18 10:24 PM
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Joined: Jan 2003
Posts: 9,670 Lima, Peru
domingo
OP
EL Master
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OP
EL Master
Joined: Jan 2003
Posts: 9,670
Lima, Peru
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Be sure not to over torque the corner intake bolts. In the service manual. Yep....but still leaked. I didnt use any sealers though with the 1104 Felpro gasket.
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Re: Best way to avoid water leaks on the ends of HEMI heads?
[Re: domingo]
#2491359
05/03/18 10:48 AM
05/03/18 10:48 AM
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Joined: Jan 2004
Posts: 4,866 North of Detroit
HemiDart68
master
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master
Joined: Jan 2004
Posts: 4,866
North of Detroit
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Verify the heads are decked flat. I had the famous water leaks on heads of that vintage. Found out they were a few thousandths out of square. Machinist did a clean up cut on them and no more leaks. I would be willing to bet that may be an issue on the other no heads of that vintage as well.
In God we trust, all others pay cash.
www.lightnens.com (Home of the world's fastest Paint Job)
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Re: Best way to avoid water leaks on the ends of HEMI heads?
[Re: domingo]
#2491360
05/03/18 10:49 AM
05/03/18 10:49 AM
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Joined: Jan 2003
Posts: 13,354 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,354
Marion, South Carolina [><]
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Never heard of an issue leaking coolant at the corners of the head. I have heard of them leaking oil through the gasket at the lower corners where the drainback passages are. I put a little bit of silicone on both sides of the head gaskets at the drainback holes...no leaks.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Best way to avoid water leaks on the ends of HEMI heads?
[Re: domingo]
#2491369
05/03/18 11:18 AM
05/03/18 11:18 AM
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Joined: Jan 2012
Posts: 2,631 Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,631
Stuttgart, Arkansas
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I would use copper coat. I know some people say they will seal dry but once when I did that I had a leak and another time I had seepage. Now I copper coat and it stays clean.
2011 Drag Pak Challenger
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