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Old 02-09-2017, 12:04 AM   #1
EverydayDiesel
 
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Copper Spray On MLS Headgasket

I had my head and block decked at the machine shop and I am using a +.020 6.7 MLS gasket.

I searched many threads on here and some say to do it and some say dont. Can this permetex copper spray do any harm?
 
Old 02-09-2017, 04:02 AM   #2
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I've never used it. I'll be interested the know, however.
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Old 02-09-2017, 05:40 AM   #3
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I don't think it'd do any harm but I wouldn't use it. A clean and dry deck and head is ideal. Recently changed a 12v head gasket that was blown and they used that copper stuff. What a pita to get it all off.
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Old 02-09-2017, 11:14 AM   #4
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I use it, and have had good luck with it. It's not going to seal combustion gasses, but it helps seal fluids. It's very thin so it doesn't cause thickness problems. I prefer the K&W over the permatex, but I'm not sure there is really much difference.

Paul
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Old 02-09-2017, 03:49 PM   #5
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I've used the permetex on multiple heads for different applications. Never had an issue so far.
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Old 02-09-2017, 04:40 PM   #6
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The guys at Fleece used a copper gasket spray on the headgaskets on my high mileage Duramax when they replaced the headgaskets when I bought the truck... They seem to be holding up fine, but we are not at huge power at all with the truck. It is only at 550/1000 but had 353,000 miles on it when we bought it and now its around 360,000 or so...
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Old 02-19-2017, 08:30 AM   #7
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I use it. Makes me sleep good at night. I doubt you hear of it making anything leak or going against what it's used for.
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Old 03-18-2017, 12:39 PM   #8
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Last summer when my buddies pulling tractor melted a piston, he had a new piston but not a new head gasket. He replaced the piston, sprayed the used head gasket with copper spray, and made 2 runs problem free until the new head gasket came.
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Old 04-28-2017, 02:58 AM   #9
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i was always taught to use it. built 3 or 5 Cr's in the 650-800 rwhp mark with nothing more than arp 425's and s400's. then again none of them ever get more than 4* above stock timing
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Old 04-28-2017, 07:18 AM   #10
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I use it on all my CR MLS build's. Like Paul said good for sealing liquids. Hang it from a clean dry area. Lightly spray the first coat. Three medium to heavy coats after that with about 10 minutes between each coat. I use about 75% of the 12oz can.
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Old 04-28-2017, 10:06 AM   #11
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Originally Posted by Freezingsystems View Post
I use it on all my CR MLS build's. Like Paul said good for sealing liquids. Hang it from a clean dry area. Lightly spray the first coat. Three medium to heavy coats after that with about 10 minutes between each coat. I use about 75% of the 12oz can.
This is what I do for all head gaskets, and sometimes on exhaust gaskets when I reuse them several times.
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Old 04-29-2017, 07:38 AM   #12
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I used it on a headgasket that had the centers cut out for fire rings, reused the head gasket and replaced the fire rings. Doesnt leak any fluid, seems to be fine.
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Old 04-29-2017, 11:09 AM   #13
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Fel Pro told us no, and i heard the same thing from another MLS manufacturer years back so we never use it on MLS, only on one piece gaskets.
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Old 04-29-2017, 12:26 PM   #14
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We use Hylomar on mls gaskets. Local race engine builder uses it and says it's better than copper spray.

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Last edited by rockjeep73; 04-29-2017 at 12:27 PM.
 
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