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Would this combo theoretically be around 11:1 compression?

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Old Jan 26, 2013 | 12:36 AM
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Default Would this combo theoretically be around 11:1 compression?

Lunatic voodoo 4" crank

Mahle flat top power pack pistons
http://pages.ebay.com/motors/link/?n...d=200822715185

Scat I beam rods 6.125
http://www.ws6project.com/user_stor/...olts-927-pin-/

Stock ls3/l92 heads
Ls3 intake
Custom cam
Not sure what head gasket to use either. But I'm shooting for 11:1 since its all motor and needs to be pump gas friendly

Does this combo work? All na lq4 408 motor shooting 500rwhp give or take a little.
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Old Jan 26, 2013 | 09:57 AM
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http://www.rbracing-rsr.com/compstaticcalc.html
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Old Jan 26, 2013 | 12:44 PM
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I don't think that calculator is working right. With his combo it's coming up at 12.16 SCR which doesn't sound right.

In here http://www.csgnetwork.com/compcalc.html that combo is right at 11.0 with 68cc chambers and -4cc pistons and stock gasket thickness.
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Old Jan 26, 2013 | 03:59 PM
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If those heads are 72cc, you need to mill them to 70cc (about .012") or use .040" Cometic gaksets.
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Old Jan 26, 2013 | 07:29 PM
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I think they are 68cc I believe
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Old Jan 26, 2013 | 07:36 PM
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Ok, for some reason I had it in my mind they were 72cc. Looks like you are right, they should be 68cc. In that case, you should be good.
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Old Jan 26, 2013 | 07:42 PM
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Awesome input.

I think you were thinking about 317s they have 72cc chambers
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