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What pistons for 4" stroke?

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Old 01-20-2003, 11:13 PM
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Default What pistons for 4" stroke?

I want to use a 4" stroker crank and a 6.125 rod. Would it be necessary to use a dished piston to maintain stock compression ratio?
How much dish?
I will be supercharging and already have TEA FI heads on the way. Supposed to lower compression from 10.25 to 9.5. Is additional dish desirable if I want to be able set back up to stock later?

Thanks,
Old 01-21-2003, 11:43 AM
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Default Re: What pistons for 4" stroke?

The Lunati kit can come with pistons that have a -8cc dish that is supposed to give you the stock compression ratio.

There is a set of these Lunati's for sale in this classifieds and also on e-bay right now.

George E.
Old 01-21-2003, 05:49 PM
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Default Re: What pistons for 4" stroke?

Thanks, George. Any idea what my comp ratio would be if I were to stay with flat top pistons and heads with 73cc chambers?
Old 01-21-2003, 07:03 PM
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Default Re: What pistons for 4" stroke?

Here's a nice calculator.

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

Using 3.9 bore, 4" stroke, no dish, .054 head gasket, .006 piston above deck, 73cc chamber gives 10.5 to 1 compression.

Using those Lunati -8cc pistons gives you 9.7 to 1

HTH

George
Old 01-21-2003, 07:09 PM
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Default Re: What pistons for 4" stroke?

George, You da heat! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

I am watching the ones on ebay; even closer now. Thanks for the info.
Old 01-21-2003, 08:55 PM
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Default Re: What pistons for 4" stroke?

I've got that exact set for sale if you're interested. $300
Old 01-21-2003, 10:18 PM
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Default Re: What pistons for 4" stroke?

I want them. Does the $300 include shipping?

Thanks




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