Thinnest gasket
#1
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Thinnest gasket
In my 509cid project, if i want to raise CR a little what is the thinnest head gasket and what brand should i use. part numbers are very very helpful. thanks, dave
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How thick is a normal head gasket? I have GM 188's that have been milled to 114.5cc, I am now putting Merlins on that I believe are 123cc. I was told that I would not want to mill these heads. What would be a good way to go about raising my compression. 454's gen 4
sorry for hijack of the thread but I was just going to ask this.
sorry for hijack of the thread but I was just going to ask this.
#7
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Rookie, you're going to lose almost a point of compression with that swap. If your block has never been zero decked, you can get about 2 cc per cyl. back by doing that. If you can mill the heads .030, you can get about 5 cc back from that. Or you can use a different set of pistons with a larger dome. I think you're going to notice the loss of power through the whole rpm range including idle otherwise.
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with the inefficiency at lower rpm 188's I have on my 425's, and the flat tappet cams. I was told that with the higher flow #'s of these new heads and better ramps and profles of the roller cam it would be a mute point. I am only looking to get it to 118cc. would this be achievable with just gasket? I will check about how much I might be able to mill these.
#9
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Rookie, you need to have .040 min distance between piston and head. If you deck the block or go to a thinner head gasket, that distance gets smaller. You will have to measure it to find out what the thinnest gasket is you can use.