Copper spray or dry on first time use Cometics?
Copper spray or dry on first time use Cometics? Block and heads are new. Heads were shaved and block decked, so surfaces should be pristine.
I know this had been debated endlessly, but most threads are older on this subject, and it was my understanding that Cometic had done something with their HG's to prevent the weeping issues?
Thanks
I know this had been debated endlessly, but most threads are older on this subject, and it was my understanding that Cometic had done something with their HG's to prevent the weeping issues?
Thanks
only prob I have seen with these is the coating will come off in places after the first use. I have reused them without issue anyway. Should I use copper spray for better multiple use on these mls gaskets? The steel layers shift with heat and cooldown. So there's constant movement across the surfaces. Would using copper spray help or be worse reusing this kind of gasket.
First, I have never in my life reused head gaskets and never will. I’m not saying it wouldn’t work or hasn’t worked for people in the past but to me it’s just not worth the risk of a leak. Second, I use a light coating of copper spray on cometics to ensure a leak free installation. The quality of cometics isn’t as nice as the OEM gaskets.
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Joined: Mar 2014
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From: Ohio
I copper spray my LS9 gaskets before putting them back on any of my cars. All boosted making decent numbers, no issues even after the 3rd re-use.
I usually won't reuse the stock gen 4 5.3 gaskets since they are cheap to replace and I can get them from most local parts stores at a moments notice.
LS9 gaskets are $100+ and are online order only for me. They're also true MLS unlike the 5.3 gaskets which have a thick graphite middle layer.
I've ran a MLS dry and then re-used it dry and had no issues with it sealing but the engine didn't stay together long due to a non related issue. I wasn't going to run them for a third time but I probably could have gotten away with it but it's been my understanding that you shouldn't re-use them because they've already been compressed. I was going to run the new set dry but figured why the hell not spray a light coat on them. It's certainly not going to hurt anything.
Dodge/Shitsubishi was plagued with head gasket leaks years ago when they went to MLS gaskets. While the initial failure was due to gasket design, the field repairs soon failed because of poor surface finish. They published a TSB for the use of copper spray on their MLS gaskets to combat the issue.
The gasket manufacturers recommendation is based upon an ideal sealing surface. IF you have a freshly machined block and head install dry per gasket manufacturer instructions. If installing the gaskets on a typical in-car head swap the copper spray is recommended to help seal voids and imperfections.
The gasket manufacturers recommendation is based upon an ideal sealing surface. IF you have a freshly machined block and head install dry per gasket manufacturer instructions. If installing the gaskets on a typical in-car head swap the copper spray is recommended to help seal voids and imperfections.
Dodge/Shitsubishi was plagued with head gasket leaks years ago when they went to MLS gaskets. While the initial failure was due to gasket design, the field repairs soon failed because of poor surface finish. They published a TSB for the use of copper spray on their MLS gaskets to combat the issue.
The gasket manufacturers recommendation is based upon an ideal sealing surface. IF you have a freshly machined block and head install dry per gasket manufacturer instructions. If installing the gaskets on a typical in-car head swap the copper spray is recommended to help seal voids and imperfections.
The gasket manufacturers recommendation is based upon an ideal sealing surface. IF you have a freshly machined block and head install dry per gasket manufacturer instructions. If installing the gaskets on a typical in-car head swap the copper spray is recommended to help seal voids and imperfections.
I remember that, we had a rash of neons come through. Still the only gasket I've used copper spray on
Don't worry about drilling the rivets as the dowel pins will keep the gaskets aligned properly.
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Joined: Mar 2014
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From: Ohio
Shake them around enough to loosen dirt, remove and dry with air compressor.
Ready to go.