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Old Jun 20, 2011 | 11:28 PM
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How much horsepower does a stock LS3 put out at the crank.
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Old Jun 20, 2011 | 11:32 PM
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430
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Old Jun 20, 2011 | 11:32 PM
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Originally Posted by rwarhol
How much horsepower does a stock LS3 put out at the crank.
430 HP; 436 HP with the NPP dual-mode (butterfly valve) exhaust.
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Old Jun 21, 2011 | 12:10 AM
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Originally Posted by mneblett
430 HP; 436 HP with the NPP dual-mode (butterfly valve) exhaust.
I thought it was 436 HP only if the dual mode exhaust was in the "wild" setting.
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Old Jun 21, 2011 | 12:28 AM
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Remember on a unmodded NPP the flaps open at around 3500 RPM....LS3 are 436 with NPP in stock, unmodded form.
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Old Jun 21, 2011 | 12:30 AM
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What he said...........
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Old Jun 21, 2011 | 08:09 AM
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Originally Posted by JimTN
I thought it was 436 HP only if the dual mode exhaust was in the "wild" setting.
Well, yeah.

HP ratings are the max HP output. 436 HP is the max HP output. That occurs when the valves are open, peak power happening well over 3500 rpm and at full throttle. Below 3500 when the NPP valves are closed, I doubt either motor is making over 250 HP. So what was posted is accurate.
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Old Jun 21, 2011 | 10:47 AM
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Originally Posted by mneblett
Below 3500 when the NPP valves are closed, I doubt either motor is making over 250 HP. So what was posted is accurate.
Since HP is based on torque & RPM.....that is a definite DUH!
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Old Jun 21, 2011 | 10:48 AM
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