External Head Gasket Leak
Thread Starter
Teching In
Joined: Feb 2019
Posts: 19
Likes: 0
From: Australia
Copper spray is your friend here. Permatex 80697
I'd use the graphite gaskets or copper spray a new set of LS6 MLS gaskets. Use your thumbnail to feel for depth of scratches, you really shouldn't feel much if any of them. If present you can have em machined or use the home doer upper system of a flat surface and sand paper. Theres a bunch of vids on youtube about it. Its not a new idea by any means but with time and patience you can achieve the same results as a machine shop
Something like this
But your probably going to be fine with new gaskets, bolts and proper torque spec.
I'd use the graphite gaskets or copper spray a new set of LS6 MLS gaskets. Use your thumbnail to feel for depth of scratches, you really shouldn't feel much if any of them. If present you can have em machined or use the home doer upper system of a flat surface and sand paper. Theres a bunch of vids on youtube about it. Its not a new idea by any means but with time and patience you can achieve the same results as a machine shop
Something like this
But your probably going to be fine with new gaskets, bolts and proper torque spec.
Copper Spray works fantastic.
Anyone whos says other is trying to sell you new gaskets or simply doesn't truly know. I've re-used all kinds of LSx MLS gaskets with copper spray successfully. I havent tried reusing head bolts yet, but I will one of these days. The gaskets are coated with some rubber that gets messed up during removal/install. Most of the guys who re-use MLS from a non leaking good running car don't clean the gasket surfaces so the rubber sealer stays in place. Anyways if the surface is smooth enough not to catch any of your finger nail and you get new bolts I'd use copper spray and go. If you have access to local parts at trade prices and most of all are not in a huge hurry? Aint never a bad plan to install new gaskets. Its always better, just not always convenient, or cost effective. Prices have come down a good bit on these though. I like the MAHLE brand LS6 5 layer for small bore. Hope this is of some help
toss a few coolant pucks in there when your done too. AC Delco 12378255
Anyone whos says other is trying to sell you new gaskets or simply doesn't truly know. I've re-used all kinds of LSx MLS gaskets with copper spray successfully. I havent tried reusing head bolts yet, but I will one of these days. The gaskets are coated with some rubber that gets messed up during removal/install. Most of the guys who re-use MLS from a non leaking good running car don't clean the gasket surfaces so the rubber sealer stays in place. Anyways if the surface is smooth enough not to catch any of your finger nail and you get new bolts I'd use copper spray and go. If you have access to local parts at trade prices and most of all are not in a huge hurry? Aint never a bad plan to install new gaskets. Its always better, just not always convenient, or cost effective. Prices have come down a good bit on these though. I like the MAHLE brand LS6 5 layer for small bore. Hope this is of some help
toss a few coolant pucks in there when your done too. AC Delco 12378255
OP, yes take them and have them decked/milled. If you don't want to raise compression tell them to take the least possible off, if you do, now is the perfect time to add a little.
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For future reference, we have 2 bore sizes of mls gaskets that will work with notched heads.
And copper spray isnt an end all be all. Its a pretty terrible idea to spray on top of the flouroelastomer etc coating on a gasket also. Im sure that gasket companies know well more than you or I about that though. It can also contaminate the cooling system. Or cause sealing issues itself by being unevenly applied or running.
Ps im not trying to sell gaskets, im giving actual professional advice. I dont care if you buy the gaskets from us or not. We offer the option regardless though.
And copper spray isnt an end all be all. Its a pretty terrible idea to spray on top of the flouroelastomer etc coating on a gasket also. Im sure that gasket companies know well more than you or I about that though. It can also contaminate the cooling system. Or cause sealing issues itself by being unevenly applied or running.
Ps im not trying to sell gaskets, im giving actual professional advice. I dont care if you buy the gaskets from us or not. We offer the option regardless though.
Thread Starter
Teching In
Joined: Feb 2019
Posts: 19
Likes: 0
From: Australia
For future reference, we have 2 bore sizes of mls gaskets that will work with notched heads.
And copper spray isnt an end all be all. Its a pretty terrible idea to spray on top of the flouroelastomer etc coating on a gasket also. Im sure that gasket companies know well more than you or I about that though. It can also contaminate the cooling system. Or cause sealing issues itself by being unevenly applied or running.
Ps im not trying to sell gaskets, im giving actual professional advice. I dont care if you buy the gaskets from us or not. We offer the option regardless though.
And copper spray isnt an end all be all. Its a pretty terrible idea to spray on top of the flouroelastomer etc coating on a gasket also. Im sure that gasket companies know well more than you or I about that though. It can also contaminate the cooling system. Or cause sealing issues itself by being unevenly applied or running.
Ps im not trying to sell gaskets, im giving actual professional advice. I dont care if you buy the gaskets from us or not. We offer the option regardless though.
I'm not trying to spend your money but I must mention that now would be an excellent time to replace lifters if they haven't been replaced already. Probably not a concern if the mileage on the motor is low.
Id recommend not making a peanut butter and copper spray gasket sandwich.
We do ship internationally every day!!
Plus our gaskets are a TAD thinner so they give better cr and quench. They can be used on non-notched heads also.
We do ship internationally every day!!
Plus our gaskets are a TAD thinner so they give better cr and quench. They can be used on non-notched heads also.
Thanks
