Re: cometic head gaskets
[Re: AndyF]
#3207790
01/24/24 01:17 PM
01/24/24 01:17 PM
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Joined: Mar 2006
Posts: 9,841 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,841
MI, usa
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I put them on dry unless They're being reussed. Then I spray with copper coat.. Torque to 85lb/ft with ARP lube. Doug
Last edited by dvw; 03/20/24 06:37 PM.
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Re: cometic head gaskets
[Re: dvw]
#3207798
01/24/24 01:29 PM
01/24/24 01:29 PM
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Joined: Jan 2004
Posts: 4,566 Motor City
6PKRTSE
master
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master
Joined: Jan 2004
Posts: 4,566
Motor City
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I put them on dry unless They're being reussed. Then I spray with copper cote.. I torque to 85lb/ft with ARP lube. Doug Same here. Dry when new, copper coat spray when re-using.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
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Re: cometic head gaskets
[Re: GY3]
#3207862
01/24/24 04:53 PM
01/24/24 04:53 PM
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Joined: Jan 2003
Posts: 13,365 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,365
Marion, South Carolina [><]
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I always spray them w/ coppercoat. Never had an issue.
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: cometic head gaskets
[Re: blowndart]
#3208035
01/25/24 08:59 AM
01/25/24 08:59 AM
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Joined: Feb 2005
Posts: 20,176 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,176
PA.
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Cometic Multi-Layer Steel (MLS) head gaskets go on dry because they are coated with a sealant. Each MLS head gasket is coated with a . 001" thick Viton rubber that is bonded to the outer stainless steel layers. Adding an additional sealer can hinder the performance of an MLS head gasket.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: cometic head gaskets
[Re: pittsburghracer]
#3208049
01/25/24 10:49 AM
01/25/24 10:49 AM
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Joined: Jan 2003
Posts: 13,365 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,365
Marion, South Carolina [><]
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I've talked to different builders and it seems to be 50/50 on spraying them versus not. Dan Costello (DRAM here, RIP) at Performance Only recommended I spray them, so I did. Never had an issue since 2006. Even after hurting some pistons w/ nitrous, I've never hurt a head gasket. Can't be too detrimental to their performance. The hemi head gasket gets REAL thin near the pushrod on a big bore too.
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: cometic head gaskets
[Re: dvw]
#3208069
01/25/24 12:34 PM
01/25/24 12:34 PM
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Joined: Mar 2003
Posts: 2,507 PA
moparacer
master
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master
Joined: Mar 2003
Posts: 2,507
PA
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I copper coat them when new. And when I reuse them, I drill the rivets out, and clean and spray both sides of the thin pieces that have the coating on them.
67 Barracuda street/bracket car 11.27-119 68 Dart 502 BB 8.70s-152 414 cid SB Dragster 7.65-174
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Re: cometic head gaskets
[Re: n20mstr]
#3208159
01/25/24 07:58 PM
01/25/24 07:58 PM
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Joined: Jun 2005
Posts: 482 Michigan
BigFish69
OP
mopar
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OP
mopar
Joined: Jun 2005
Posts: 482
Michigan
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Thanks for the reply seems both ways work for everyone. also this one will see its fair share of nitrous.
Last edited by BigFish69; 01/25/24 08:09 PM.
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Re: cometic head gaskets
[Re: BigFish69]
#3208248
01/26/24 10:19 AM
01/26/24 10:19 AM
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Joined: Dec 2021
Posts: 1,130 Loudoun County, VA
Brad_Haak
super stock
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super stock
Joined: Dec 2021
Posts: 1,130
Loudoun County, VA
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The Mr. Gasket MLS gaskets I put on dry before the last dyno session showed indications of fluid seepage, even though they are coated and supposed to not need anything else. When I put the heads back on, I switched to Cometics and used the Mopar spray-on sealer the dealers used when replacing all the blown-out Dodge Neon head gaskets with MLS years ago. The heads' gasket surface are definitely smooth enough for MLS, but the block deck may not be and I didn't want to take another chance with leaks.
2021 Challenger 6.4L Scat Pack 1320 100% stock: 1.680, 11.894 at 113.75 (DA 175 ft) weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008] pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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Re: cometic head gaskets
[Re: Brad_Haak]
#3208254
01/26/24 10:43 AM
01/26/24 10:43 AM
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Joined: Jan 2003
Posts: 4,050 Shelby Twp. Mi
HardcoreB
master
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master
Joined: Jan 2003
Posts: 4,050
Shelby Twp. Mi
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The Mr. Gasket MLS gaskets I put on dry before the last dyno session showed indications of fluid seepage, even though they are coated and supposed to not need anything else. When I put the heads back on, I switched to Cometics and used the Mopar spray-on sealer the dealers used when replacing all the blown-out Dodge Neon head gaskets with MLS years ago. The heads' gasket surface are definitely smooth enough for MLS, but the block deck may not be and I didn't want to take another chance with leaks. I remember reading this with yours and maybe a couple others using that Mr, Gasket headgasket. I play with headgasket assemblies very often and have evolved my 'process' to use small films of easily displaceable sealers around water. Permatex pipe-dough etc. I have used that same 'failure-prone' gasket a few times and have had 100% success. IIRC the Mr. Gasket one lacks raised beads around some cooling areas? But again, use what you are comfortable with! I wasn't going to chime-in because I knew there'd be many techniques and obviously they'll vary with what I do out of respect for abilities. One of the main reasons for me is like DVW has mentioned is typically you get that sealing film delaminating in areas so when you start stacking up overlapping 'hanging chads' you'll get a recipe for a leak. I have never thrown out a MLS gasket, always reusing them. Respectfully, Sean
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Re: cometic head gaskets
[Re: HardcoreB]
#3208264
01/26/24 11:25 AM
01/26/24 11:25 AM
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Joined: Dec 2021
Posts: 1,130 Loudoun County, VA
Brad_Haak
super stock
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super stock
Joined: Dec 2021
Posts: 1,130
Loudoun County, VA
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I'd have reused the Mr. G's with the same spray coating, except I figured out I needed to use the 4.50" instead of 4.41" while it was torn down. The price difference was moot at the time, so I decided to give the Cometics a try. Still have the Mr. G's hanging on the wall in my garage, FWIW.
2021 Challenger 6.4L Scat Pack 1320 100% stock: 1.680, 11.894 at 113.75 (DA 175 ft) weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008] pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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Re: cometic head gaskets
[Re: Brad_Haak]
#3221626
03/20/24 10:24 AM
03/20/24 10:24 AM
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Joined: Oct 2004
Posts: 2,820 Connecticut
FurryStump
master
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master
Joined: Oct 2004
Posts: 2,820
Connecticut
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Always did dry, last time I sprayed them with copper coat and got a very small amount of water in a cylinder. Went back to dry and no issues so far. I don’t reuse them. I know you can, but I’m lazy and hate doing things twice. Oh, watch out that the center rivet doesn’t get pinched between the block and head it you are using stock castings.
Last edited by FurryStump; 03/20/24 10:25 AM.
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Re: cometic head gaskets
[Re: dvw]
#3221841
03/21/24 08:26 AM
03/21/24 08:26 AM
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Joined: Jan 2008
Posts: 1,212 Minn
SportF
pro stock
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pro stock
Joined: Jan 2008
Posts: 1,212
Minn
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I appreciate that info. I've reused them as many as 3 times at 15-1. 100's of passes with no issues. The only reason that they get sprayed is that some of that runbber coating gets a little shreaded. Doug
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