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Compression Question

Old Oct 20, 2013 | 01:08 PM
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Default Compression Question

I am going to put .030 milled LS3 heads using .041 head gaskets on my LS2. Can someone give me a compression ratio estimate with this setup?
Thanks
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Old Oct 20, 2013 | 03:02 PM
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Originally Posted by mklaus1
I am going to put .030 milled LS3 heads using .041 head gaskets on my LS2. Can someone give me a compression ratio estimate with this setup?
Thanks
This won't be accurate but just to give you an idea. Since the heads are milled .030 I would assume that would take the chamber down to 62cc from 70cc. Your gasket bore is 4.080 and with a flat top piston on a 0 deck it would come out to 11.53:1.

You can do this yourself. Here's the link.

http://www.csgnetwork.com/compcalc.html
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Old Oct 21, 2013 | 08:16 AM
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Originally Posted by bozzhawg
How much does your piston come up out of the hole(cylinder bore) @ TDC?

Knowing this will also help you calculate your target quench and which head gasket to use. Many people overlook this.
Originally Posted by 87silverbullet
This won't be accurate but just to give you an idea. Since the heads are milled .030 I would assume that would take the chamber down to 62cc from 70cc. Your gasket bore is 4.080 and with a flat top piston on a 0 deck it would come out to 11.53:1.

You can do this yourself. Here's the link.

http://www.csgnetwork.com/compcalc.html

Thanks guys for the info. I never measured out of the hole, it is a stock LS2 bottom end, I am not sure if there is a standard out of hole for an LS2 or if all engines are a little different. Thanks for the replies, I will see if I can get a meausrement for out of the hole, I am guessing you would use a dial indicator to measure that distance, I know it isn't much if any.
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