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Author Topic: Build question on 103" head gaskets  (Read 12216 times)

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hdrider53

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Re: Build question on 103" head gaskets
« Reply #30 on: April 29, 2010, 08:34:55 PM »

I got two head gaskets in my hand to choose from. The one in the kit measures out to be a .055 thickness so after compression I used .050 as the number. The other is a .032 copper head gasket from Big Boyz I read it doesn't compress at all.

Ran the numbers with .010 deck, 79 cc combustion chambers and the 47 degree cam ends up at 9:04.1 and 186 ccc with the .055 HG. The .032 HG ends up with 9.37:1 and 195 ccc.

The .032 looks border line high on CCC and CR but the .055 may not give me enough compression for that cam to work at its best. Plus my squish will be .060 with the .055 HG which is too large I think.
 I put one or the other in tomorrow any last suggestions.
« Last Edit: April 29, 2010, 11:04:44 PM by hdrider53 »
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HD Street Performance

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Re: Build question on 103" head gaskets
« Reply #31 on: May 01, 2010, 09:51:48 AM »

Fix the .010 down pistons or have the heads step decked to compensate for the pistons down. Get as close as you can to .030 and no worrys with compression a little on the high side. At .042 squish and 9.37:1 corrected for cam compression you may have issues and will have to have a good tune at least.
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