Re: Hemi head gaskets Cometic vs Felpro
[Re: Moparrob68]
#2750297
03/08/20 10:14 PM
03/08/20 10:14 PM
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Joined: Aug 2003
Posts: 43,292 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,292
Bend,OR USA
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I'm thinking the sleeves on all aluminum blocks should be above(.002 to .0050 max ) the deck surfaces due to the increase height of those blocks when they get warmed up. I would call World and ask them
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Hemi head gaskets Cometic vs Felpro
[Re: Moparrob68]
#2750761
03/10/20 02:21 PM
03/10/20 02:21 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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I have a 572 World 4.50 bore aluminum Hemi with Edelbrock Victor heads and Cometic head gaskets that has a coolant leak into the valley after 2 summers of street/strip use.Tried retorqueing the head studs and it got worse.When I removed the heads the gaskets had coolant between the layers. I called Barton and he said he has seen the sleeves "settle"in aluminum blocks and allow coolant to weep up from the lower steam holes around the fire ring and down the exhaust pushrod reliefs.I measured the sleeves and they are 0.0005-0.001 below the deck. I was thinking of trying the Felpro 1104 or Edelbrock gaskets but i noticed in the picture they don't have the 2 steam holes in the outer corners.Has anyone had success using the Felpro"s I had a coolant leak on my World aluminum block as well , when using the Cometic gaskets. I found out that the World block with the three coolant holes on the bottom uses a different Cometic gasket. I switched to the correct Cometic gaskets and ended the problem. Does your block have the three holes on the bottom ? Also a smear of Hylomar around the coolant passages was applied. You can see in the picture where the standard coolant holes in the original gasket were below the bores . those are not present on the new gaskets. Also has better coverage at the main coolant passages IIRC. The part # is H2807SP3051S for gaskets that are .051 thick and have the three large coolant holes across the bottom. The last 3 digits determine the thickness, so 040S would be .040 thick. Mark
Last edited by Hemi Allstate; 03/10/20 03:13 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: Hemi head gaskets Cometic vs Felpro
[Re: Moparrob68]
#2865636
12/28/20 11:48 AM
12/28/20 11:48 AM
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Joined: Dec 2020
Posts: 10 Farnham, Quebec Canada
Erick Char
member
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member
Joined: Dec 2020
Posts: 10
Farnham, Quebec Canada
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Hi all, I am Eric and I am a new member,
I have the same leaks using the C5447-40 Cometic gaskets. I am building a 528" Hemi with the 088515 4.500" bore World aluminum block and the Edelbrock Victor heads.
It is a 2018 block and has 2 steam holes per bank, near the sleeve at cylinders 1, 2, 7 and 8. I also have the FelPro 1104 gaskets and would drill them for the steam holes. I think they will cure the leaks but they are 0.051" thick.
Anybody has infos about the Cometic C15620-040," Chrysler Gen-2 426 Hemi .040" MLS Cylinder Head Gasket, 4.500" Bore, World Products Block" ?
Regards,
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Re: Hemi head gaskets Cometic vs Felpro
[Re: Erick Char]
#2865715
12/28/20 02:44 PM
12/28/20 02:44 PM
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Joined: Sep 2003
Posts: 19,591 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,591
north of coder
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welcome to the board Eric ! my name is Eric as well. [not sure if that is good or not ! ] i can't help you with your question, but glad you are here.
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Re: Hemi head gaskets Cometic vs Felpro
[Re: Moparrob68]
#2868547
01/03/21 04:49 PM
01/03/21 04:49 PM
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Joined: Dec 2020
Posts: 10 Farnham, Quebec Canada
Erick Char
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member
Joined: Dec 2020
Posts: 10
Farnham, Quebec Canada
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Hi again, i finally found the reason of the leak. The sleeves are supposed to be dry, not exposed to coolant. Coolant leak from exhaust pushrod holes #4 and #8 The front steam hole of bank 2 is drilled too close to the sleeve, no more block material between them. So the pressurized coolant follow the empty spaces between the upper parts of the sleeves and block deck up to the exhaust pushrod holes where there is no aluminum wall left (cylinders 4 and 8 in my case). So my idea is to plug these steam holes with a threaded plug or a some sort of a metal bonding. I am thinking of drilling the 2 lower steam holes of each cylinder on the block. I will update my post about my findings... Any help is welcome!
Last edited by Erick Char; 01/03/21 04:55 PM.
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Re: Hemi head gaskets Cometic vs Felpro
[Re: Erick Char]
#2868589
01/03/21 06:40 PM
01/03/21 06:40 PM
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Joined: Jan 2003
Posts: 7,498 Minnesota
Hemi_Joel
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master
Joined: Jan 2003
Posts: 7,498
Minnesota
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With that hole touching the sleeve, I'd be reluctant to thread it. I'd make a press fit aluminum plug, put some locktite on it, and press it in.
[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: Hemi head gaskets Cometic vs Felpro
[Re: dthemi]
#2868802
01/04/21 11:36 AM
01/04/21 11:36 AM
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Joined: Jan 2003
Posts: 10,757 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,757
North Dakota
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In case you want to fix it. Make, or borrow a draw bar that pulls the sleeve down from the mains. While under pressure from the bar, beat the draw plate with a really heavy dead blow hammer until it would move a tenth. Measure all the sleeves to the deck, and use the lowest as your standard. Heat the block up ( I use a big kerosene torpedo heater) pull the sleeves, then deck the bare block to what you want for sleeve height.Then heat it up again, replace sleeves, let it cool, then use the draw bar and hammer again to positively seat them.
I've seen new blocks drop sleeves .01 Maybe I'm misunderstanding the procedure but what prevents the sleeves from moving downward again?
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Hemi head gaskets Cometic vs Felpro
[Re: Moparrob68]
#3018479
02/24/22 02:13 PM
02/24/22 02:13 PM
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Joined: Jan 2003
Posts: 17,907 S.E. Michigan
ZIPPY
I Live Here
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I Live Here
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S.E. Michigan
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Enjoyed this older thread just for education purposes.
Never know, might get one of those blocks someday.
Hasn't really been any closure, though.
So I'm going to ask...how have you guys repaired this?
I'm thinking maybe lightly press in a plug with a smaller steam hole drilled off center to get it away from the sleeve, or thread the hole and install a homemade "jet" with a similar hole, or something like that.
Rich H.
Esse Quam Videri
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