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Cometic Head Gasket/ Aluminum Head
#1567126
01/22/14 03:32 PM
01/22/14 03:32 PM
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Joined: Jan 2003
Posts: 3,862
N.E. Ohio
6bblFLASH
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,862
N.E. Ohio
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I do not doubt that a Cometic Coated Steel-Shim gasket will seal well. I am more wondering if the raised ridges of the gasket will wear the head over time? Also with a .039 Fel-Pro I will have .056 quench .027 Cometic-------------..044```` This on a street driven,boosted 440. Don`t know if its even with the effort????  Opinions????
70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas
9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ!
2013 StickShift Challenge Winner@ Mopar Nationals!
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Re: Cometic Head Gasket/ Aluminum Head
[Re: B G Racing]
#1567131
01/22/14 05:04 PM
01/22/14 05:04 PM
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Joined: Oct 2009
Posts: 1,288
Oregon
sg66mopar
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,288
Oregon
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Quote:
The Cometics don't seem to groove the aluminium heads like the heavy fire ring on the composite gaskets. 
My experience also.
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Re: Cometic Head Gasket/ Aluminum Head
[Re: sg66mopar]
#1567132
01/22/14 05:21 PM
01/22/14 05:21 PM
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Joined: Jan 2003
Posts: 13,543
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,543
Marion, South Carolina [><]
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Quote:
Quote:
The Cometics don't seem to groove the aluminium heads like the heavy fire ring on the composite gaskets.
My experience also.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 4 speed, Dana 60
'71 Demon 340, no drivetrain, on blocks behind the barn
'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: Cometic Head Gasket/ Aluminum Head
[Re: an8sec70cuda]
#1567133
01/23/14 09:31 AM
01/23/14 09:31 AM
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Joined: Jan 2003
Posts: 3,862
N.E. Ohio
6bblFLASH
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,862
N.E. Ohio
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Okay. Nothing but positive response. Cometics it is. Thanks
70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas
9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ!
2013 StickShift Challenge Winner@ Mopar Nationals!
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Re: Cometic Head Gasket/ Aluminum Head
[Re: 80fbody]
#1567135
01/23/14 09:44 AM
01/23/14 09:44 AM
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Joined: Mar 2008
Posts: 202
Barboursville, VA
belvedere383
enthusiast
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enthusiast
Joined: Mar 2008
Posts: 202
Barboursville, VA
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Nothing but good experiences with Cometic gaskets in my engines.
My last engine did not have the deck surface of the block machined and the gaskets sealed with no problem for 6 years with Indy heads.
Would recommend for used in most engines.
65' Belvedere
496'' Stroker
Indy Heads
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Re: Cometic Head Gasket/ Aluminum Head
[Re: 80fbody]
#1567136
01/23/14 10:19 AM
01/23/14 10:19 AM
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Joined: Jan 2003
Posts: 13,543
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,543
Marion, South Carolina [><]
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As long as your deck surfaces weren't cut on an old or dull rotary broach, or any type of cutter that leaves a rough surface, then you should be OK.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 4 speed, Dana 60
'71 Demon 340, no drivetrain, on blocks behind the barn
'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: Cometic Head Gasket/ Aluminum Head
[Re: 80fbody]
#1567139
01/23/14 11:59 AM
01/23/14 11:59 AM
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Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
Never run Cometics but I think you'll need a special finish put on the deck/heads in order for them to seal properly. If your stuff is already finish machined then it could be pretty costly to use them.
If you feel your deck finish is too rough,use a good coating of Alumispray or Copperspray from Permatex,allow to get tacky then install.
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Re: Cometic Head Gasket/ Aluminum Head
[Re: 6bblFLASH]
#1567141
01/24/14 11:50 AM
01/24/14 11:50 AM
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Joined: Jan 2012
Posts: 2,767
Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,767
Stuttgart, Arkansas
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Yes, I would copper coat as a precaution. And yes I understand that 50,000 people put them together dry and they don't leak but if I don't use copper coat it might seep.
2011 Drag Pak Challenger
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Re: Cometic Head Gasket/ Aluminum Head
[Re: rickseeman]
#1567142
01/24/14 12:16 PM
01/24/14 12:16 PM
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Joined: Jan 2003
Posts: 13,543
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,543
Marion, South Carolina [><]
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Quote:
Yes, I would copper coat as a precaution. And yes I understand that 50,000 people put them together dry and they don't leak but if I don't use copper coat it might seep.
I always spray mine. Spray in between the layers too.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 4 speed, Dana 60
'71 Demon 340, no drivetrain, on blocks behind the barn
'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: Cometic Head Gasket/ Aluminum Head
[Re: an8sec70cuda]
#1567144
01/24/14 12:25 PM
01/24/14 12:25 PM
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Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing
master
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master
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
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Quote:
Quote:
Yes, I would copper coat as a precaution. And yes I understand that 50,000 people put them together dry and they don't leak but if I don't use copper coat it might seep.
I always spray mine. Spray in between the layers too.
We cut all but one rivit off and spray all sides when using multiple times.Caution must be taken to see if any of the rivits interfere between the head and deck.
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Re: Cometic Head Gasket/ Aluminum Head
[Re: 80fbody]
#1567145
01/24/14 01:28 PM
01/24/14 01:28 PM
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Joined: Jan 2003
Posts: 13,543
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,543
Marion, South Carolina [><]
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Quote:
You guys have no problems reusing them after copper coating the layers on the first use?
Nope. When I reuse them, I just clean them off w/ gas or some type of solvent, then respray and install.
Like Bob said, make sure the rivets aren't in b/t the head and the block...the ones on my wedge motor were and had to remove them.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 4 speed, Dana 60
'71 Demon 340, no drivetrain, on blocks behind the barn
'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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