LS2 Head Comparo

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Apr 8, 2007 | 09:15 PM

saywhenn94

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From: Warren, Mi.

LS2 Head Comparo

If i'm not mistaken the LS2 head is the same as the LS6?? I'm going to buy a set of Dart Pro 1 225's...which have a 62cc combustion chamber as compared to 67cc for the LS2. If the LS2 has 10.9 cr and I use the Darts with a stock gasket where would that put my CR? Could I still run 93 octane?

Thanks,
Rich

Apr 8, 2007 | 10:14 PM

405HP_Z06

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From: Arlington, Tx

Quote:

Originally Posted by saywhenn94

The LS6/2 heads have a 65cc combustion chamber.

Everything else the same, you will get an 11.29 compression ratio with the 62cc Darts.

Last edited by 405HP_Z06; Apr 9, 2007 at 08:01 PM.

Apr 9, 2007 | 10:38 AM

HEMIETR

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From: Jenison, MI

LS2 has a 64cc combustion chamber. To know your true CR you will need to know piston to deck clearence. Mine was .005 out of the hole. The majority of people go with a .040 gasket to avhieve a tighter quench.

Apr 9, 2007 | 01:29 PM

405HP_Z06

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From: Arlington, Tx

Quote:

Originally Posted by HEMIETR

Factory spec for the 243 is 64.43cc but if you measure, on average, they are closer to 65cc. I set the piston .005 out of the hole to get the 11.29, which is close to average. Of course, measuring actual would be the most accurate.

I guess it depends on if you want to know theoretical or actual compression ratio.

Last edited by 405HP_Z06; Apr 9, 2007 at 08:02 PM.

Apr 9, 2007 | 06:57 PM

saywhenn94

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From: Warren, Mi.

So then 93 octane is still doable? When the time comes i'll measure piston to deck at all 4 corners to see exactly where i'm at. So I should come in around 11.3:1 with a stock gasket?

Thanks,
Rich

Apr 9, 2007 | 07:59 PM

405HP_Z06

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From: Arlington, Tx

Quote:

Originally Posted by saywhenn94

So then 93 octane is still doable? When the time comes i'll measure piston to deck at all 4 corners to see exactly where i'm at. So I should come in around 11.3:1 with a stock gasket?

Thanks,
Rich

Yes, 93 should work fine.

See attached file for CR calculation.

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