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340 compression reducing head gasket
#1079653
09/21/11 07:45 AM
09/21/11 07:45 AM
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Joined: Dec 2003
Posts: 974
qkRick
OP
super stock
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OP
super stock
Joined: Dec 2003
Posts: 974
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Hi People, Looking for a little help here. I have a nicely built 340+.030 with a compression ratio of 10.3: 1 Engine has steel heads. Could a simple head gasket change reduce the CR enough to run pump gas. If so any info re: thickness and manufacturer appreciated. Thanks MoParts
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Re: 340 compression reducing head gasket
[Re: fox]
#1079655
09/21/11 10:30 AM
09/21/11 10:30 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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What Fox said, if you have quench now a thicker gasket will actually hurt you and if you have no quench you will not be able to lower it enough with a change to a composition gasket with the exception of possible a custom thick $Cometic$ one which will then need a custom thick $cometic$ intake gasket(s) to go along with it for intake alignment. Compromising your advance curve will help SLIGHTLY but will SEVERELY hurt your power & make it run hotter. Is that a measured 10.3? A wilder cam will bleed off psi but if you dont want a wilder one then call one of the cam companies & inquire about a custom cam that will lower it but not be lumpier maybe one with a late closing intake valve (dont quote me on that). Myself I'd pull the heads & judiciously hog out the chambers but plug your dimentions into KB's calculator to see how many CC's need to be added to see if chamber work would be practical as you can only remove so much EDIT and we'd need to figure out what SCR we're shooting for
Last edited by RapidRobert; 09/21/11 11:11 AM.
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