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Compresstion question!!

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Old Feb 2, 2009 | 03:40 AM
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Question Compresstion question!!
I have built 346ci with 72cc Heads the compresstion is around 8:5.1 with stock sized head gasket now I'm thinking about going with 57cc heads from TSP with a thiner head gasket for 11+ compresstion is that possible???


Does anybody have any idea what my compresstion will be???



Thanks.
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Old Feb 2, 2009 | 09:09 AM
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Originally Posted by venom ws7
I have built 346ci with 72cc Heads the compresstion is around 8:5.1 with stock sized head gasket now I'm thinking about going with 57cc heads from TSP with a thiner head gasket for 11+ compresstion is that possible???

Does anybody have any idea what my compresstion will be???

Thanks.
I don't even know what compresstion is.

If you mean compression here are two online calculators that might help:

http://www.c5frc.com/calculators/Com...Calculator.htm

http://www.rbracing-rsr.com/compstaticcalc.html
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Old Feb 2, 2009 | 01:41 PM
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Are your pistons true flat-tops, or do they have valve relief or dish? If so, how many cc is the relief or dish? With a true flat-top like the OE piston, you'd have over 12:1 with a .040" and 57cc chamber!
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Old Feb 2, 2009 | 03:48 PM
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I'm gonna hi-jack for a second.

Matt, I have one of your forged 347's with Diamond pistons. I have stock replacement Fel Pro head gaskets and a set of stock LS2 heads. What would my compression be?
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Old Feb 2, 2009 | 05:18 PM
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Originally Posted by Twotonefreak
I'm gonna hi-jack for a second.

Matt, I have one of your forged 347's with Diamond pistons. I have stock replacement Fel Pro head gaskets and a set of stock LS2 heads. What would my compression be?
What cc are the pistons? What compressed thickness is that gasket?
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Old Feb 2, 2009 | 07:55 PM
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Originally Posted by Matt@Texas-Speed
Are your pistons true flat-tops, or do they have valve relief or dish? If so, how many cc is the relief or dish? With a true flat-top like the OE piston, you'd have over 12:1 with a .040" and 57cc chamber!


Thanks for replying Matt,

If I'm not mistaken the pistons have -9cc Valve relief.
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Old Feb 3, 2009 | 09:14 PM
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Ttt



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