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Dec 28, 2003 | 07:00 AM

4thGENRETARD

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From: Further South than Hell

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I got into this debate with a friend of mine.
PP LS1 StageII VS PP 5.3 Stage II

Which would make more power on the same motor??

Dec 28, 2003 | 11:15 AM

XFiveLiter

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The 5.3s would make a little more power due to the higher CR. That's the only difference between the heads, I believe.

Last edited by XFiveLiter; Dec 28, 2003 at 11:46 AM.

Dec 28, 2003 | 11:18 AM

99 Black Bird T/A

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I agree with above.

The 5.7's with lower compression might allow a hair more P to V clearance on a factory short block?

Dec 28, 2003 | 11:44 AM

WOT

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so what is the test motor? that needs to be addressed. is it a 346 or a larger displacement? more needs to be outlined for any true results.

Dec 28, 2003 | 01:38 PM

4thGENRETARD

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From: Further South than Hell

346cu, LT,TR224,lid,Ported TB and MAF ends.

Dec 28, 2003 | 01:56 PM

SPANKY LS1

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As said above, if both the 5.7 and the 5.3 heads are milled the same amount, the 5.3s will have higher compression and make more power, assuming that the higher compression does not cause KR.

Shawn

Dec 28, 2003 | 02:10 PM

Mike K.

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also the 5.3's can attain a higher cr without being milled which is a plus for pv clearance.

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Dec 28, 2003 | 04:14 PM

foff667

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they are two different beasts...two different combustion chambers, valve sizes & compression ratios...i would say if they were both milled to the same compression ratio that the ls6 would fair a hair and i do mean a hair better only due to the valve sizes.

lata
Bill

Dec 28, 2003 | 04:39 PM

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Mike98WS6

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I sure hope those 5.3 stage 2 Patriot's are gonna make the power everyone says they are. I'm planning on putting them on this week. I hope I'm not making a mistake.