who has cometics that dont leak
#21
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Originally Posted by redtail2426
why did you guys use the copper spray and how much did you use???trying to figure out if i should or not.
#29
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I had AFR 205's milled .010 mounted on .040" Cometics dry with stock bolts. Ran it for about 6 mos. and 1500 miles. Then removed the heads, had them milled another .020", used the Cometics torqued just slightly to notch the pistons, then re-used them dry with stock head bolts again. No leaks for the last 6 mos. and ~1000 miles.
One other thing I should say. When GM put my engine together, they dropped the driver's side head on the driver's side deck at the front. I matched the bottom front corner of the head to the gouges in the deck, about 6 of them. The first was deep, about .060" and about 1" long. It was outside of the coolant holes and went just about to the edge of the deck. Then the other ones that went towards the exhaust were successively smaller. They used the stock .052" graphite gaskets and there was coolant in the gouges out towards the edge of the block until the channels got too small and I guess the graphite gasket filled.
When I took my heads off the first time and saw this I was like . I got some FastSteel and mixed it and applied it to the grooves and got it as smooth and level with the surrounding area as I could. It worked out because even with the Cometics, I didn't have any leaks and there were no signs of coolant traveling where I put the FastSteel.
One other thing I should say. When GM put my engine together, they dropped the driver's side head on the driver's side deck at the front. I matched the bottom front corner of the head to the gouges in the deck, about 6 of them. The first was deep, about .060" and about 1" long. It was outside of the coolant holes and went just about to the edge of the deck. Then the other ones that went towards the exhaust were successively smaller. They used the stock .052" graphite gaskets and there was coolant in the gouges out towards the edge of the block until the channels got too small and I guess the graphite gasket filled.
When I took my heads off the first time and saw this I was like . I got some FastSteel and mixed it and applied it to the grooves and got it as smooth and level with the surrounding area as I could. It worked out because even with the Cometics, I didn't have any leaks and there were no signs of coolant traveling where I put the FastSteel.