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HELP! Heads/cam ls1 down on power

Generation III Internal Engine 1997-2006 LS1 | LS6

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HELP! Heads/cam ls1 down on power

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Apr 6, 2017 | 06:36 PM

#1

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Staging Lane

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HELP! Heads/cam ls1 down on power

Kinda stumped here, recently Did heads and cam on my 99 ls1. Ms3 cam with a 113 lsa, ported pro comp 225cc heads, ls6 intake, longtubes and other small bolt ons. Car put down 337whp???? And made a 12.9 pass with radials. I've seen other h/c cars put down wayyy better numbers than that. I double checked pushrod length and it's good, I've had the tune looked at and it's fine. I just can't figure out what's going on.

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Apr 6, 2017 | 06:41 PM

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Is the car a 6 speed or auto? If its an auto do you have an aftermarket stall converter?
Was it on a mustang dyno?
What was your trap speed?

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Apr 6, 2017 | 06:43 PM

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Staging Lane

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It's a 6 speed car, 4.10 gears, trapped 109

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Apr 6, 2017 | 07:22 PM

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Hmm. I don't know anything about those heads Is the cam installed correctly? Leak down test? That car should should trap atleast 118

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Apr 6, 2017 | 07:28 PM

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Staging Lane

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A leak down test is my next step.

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Apr 7, 2017 | 01:17 AM

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What Rpm were your peak hp and tq?

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