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2003 ls/lq4 6.0l engine

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Old 09-15-2013, 11:35 AM
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Default 2003 ls/lq4 6.0l engine

[SIZE="4"][B]Guys,

I know this question has been asked a 1000 times and sure there are several guys who have done the same or very similar mod's to their engines who can answer our question.

WHAT HP CAN YOU EXPECT FORM OUR ENGINE WITH THE FOLLOWING MOD'S THAT HAVE BEEN DONE TO THIS POINT ??

1.) BASE ENGINE
2.) 1.75" HEADERS W//3" PIPES
3.) TICK PERFORMANCE CAM,VALVE SPRINGS & PUSHRODS
4.) 85mm TB
5.) 85mm MFS
6.) LS6 INTAKE
7.) 42# INJECTORS
8.) KEN WOLKENS ,WIRING HARNESS
9.) GM COMPUTOR FLASHED

Going to have it TUNED when we take her to get DYNO'D.

We have heard anywhere from 400HP to 545HP !!!!!!!!!!!

Standing by,
Old 09-15-2013, 04:52 PM
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I would say around 380-400 rwhp. I made 333rwhp with just ls6 intake headers and ported 78mm tb through a t56.
Old 09-15-2013, 05:03 PM
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I have an lq9 with very similar setup that made right at 400rwhp
Old 09-15-2013, 05:26 PM
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Do you know what the compression will be?
Old 09-16-2013, 06:49 PM
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What are the cam specs? That would be the big factor.

I just built and dyno'd a mule motor similar to yours.

Stock LQ4
243 Heads
Ls1 cam
1 3/4 to 1 7/8 step headers
Super victor intake
Holley ultra HP 750

It made 420 ft.lbs. of tourqe @ 4700 and 401 HP at 5700.

Clearly the cam is the limiting factor. But this way I know what HP gains I from each cam I tryout.

https://www.facebook.com/photo.php?v=566021123457784



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