Best 4.500" Hemi headgaskets?
#1266923
07/13/12 12:59 PM
07/13/12 12:59 PM
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Joined: Jul 2009
Posts: 413
Norway (old world)
Oyvind Mopar
OP
mopar
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OP
mopar
Joined: Jul 2009
Posts: 413
Norway (old world)
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Hi, after building a 557 Hemi with World block and Aluheads, I notice some small leakage of coolant from between head and block on the exhaust side. Worst in both ends. Overnight there is a leakage on both sides of between 0,5 and 1cc. The engine is not yet started. It uses composite type brand X red/brown head gaskets that are lacquered. I added a thin layer of RTV on both sides where all water and oil holes are. Clamping force with ARP studs, at 75-80 lbft. Yes, I know it is Friday the 13th, but it started earlier.....  Will this dissapear when engine gets hot? Or, will I have to buy better gaskets, then which type/part number?  Thanks! Oyvind Mostad / Norway
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Re: Best 4.500" Hemi headgaskets?
[Re: Oyvind Mopar]
#1266924
07/13/12 01:43 PM
07/13/12 01:43 PM
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Joined: Jan 2012
Posts: 2,677
Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,677
Stuttgart, Arkansas
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WOW, a water leak before you even started it? That's bad. Makes me think it might be something besides a head gasket. How else could it leak with no pressure yet? People on this side of the pond used to use Fel-Pro's normally sprayed with copper coat but lately everybody uses Cometic. At first they said put them on dry, now some people say spray them with copper coat. Cometic says they want a smooth finish on the surfaces. Take it apart and try again. Get a straight edge and make sure the decks and heads are flat. Set the heads on the block with no gasket and make sure the dowel pins aren't holding it up. Make sure the studs aren't running out of threads. Sorry for your problem.
2011 Drag Pak Challenger
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Re: Best 4.500" Hemi headgaskets?
[Re: Oyvind Mopar]
#1266926
07/13/12 05:53 PM
07/13/12 05:53 PM
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Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate
master
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master
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
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Last edited by Hemi Allstate; 07/13/12 06:07 PM.
1996 Ram 1500 Sport
1968 road runner
1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: Best 4.500" Hemi headgaskets?
[Re: dogdays]
#1266930
07/13/12 10:57 PM
07/13/12 10:57 PM
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Joined: Jan 2003
Posts: 9,670
Lima, Peru
domingo
EL Master
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EL Master
Joined: Jan 2003
Posts: 9,670
Lima, Peru
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Quote:
Use a little blue Hylomar on both sides of the gaskets but just around the water holes.
R.
Dont spend extra if they are still new and the engine hasnt been run.
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Re: Best 4.500" Hemi headgaskets?
[Re: Oyvind Mopar]
#1266932
07/14/12 07:45 AM
07/14/12 07:45 AM
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Joined: Jan 2003
Posts: 2,933
A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,933
A shed in England
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My old 528 wedge did that, (Apples and oranges I know) Heads weren't flat. You could try warming it up and re-torquing but if it was me I'd be looking to find out why it's leaking.  HTH's Tig.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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