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Old 12-17-2009, 11:03 PM   #1
SimpleManLance
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Default motor for 122hh, 10psi + 75 shot

i have a 03 6L that i want to use as a base for this motor. what would you do to the motor? cam? forged rods, pistons? what brand? this would deffently have to be a buget build $2-2500 limit for the long block.

i figure 10psi should be good enough to stay away from belt slip issues, and heat problems. and if i feel the need for more power i will spray a 75 shot.

i figure i would spin the motor up to 6k max and just try and make as much power up till then.

how would you build this motor and why?
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2000 GMC Sierra Z71 5.3
Flex-a-lite electric fans, 160 degree stat 3in hooker Aerochamber, cutout, pacesetter lt and ORY, 4l80E swap, 255LPH, 02 ls6 cam, 90mm TB, 122HH, 3.2 pulley.
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Old 12-18-2009, 04:43 AM   #2
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If I had to rebuild my LQ4 for MP122 duty, I'd use Eagle H-beam rods, forged pistons, and use the stock crank. Aim for about 10:1 c/r. I like the LS6 cam and high lift rocker arms that I'm using now. That won't change. I might port the heads a little, but that would be out of your price range. I'm at 9psi (2.8" blower pulley) on my stock short block LQ4. I'm hoping it will last a while longer. I have a 75 shot on it, but use it only at the track.
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Old 12-18-2009, 05:49 AM   #3
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Probe 6.125 4340 I-Beam Connecting Rods
Probe Forged Flat Top Pistons -3cc reliefs
Federal Mogal Main/Rod Bearings
Stock Cam Bearings
ARP Main Stud kit part#234-5608
springs/titanium retainers/stock locks
GM MLS Head gaskets
Melling oil pump 10296 w/ blue spring.
I'd get a Custom Cam but a GT2-3 would also work.
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Old 12-18-2009, 05:50 AM   #4
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does the 03 6L have any internal problems?
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12.4 @ 108 4.0" pulley high 30 degree weather
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Old 12-18-2009, 05:50 AM   #5
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thanks for the reply. what times do you run with out the 75 shot?
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Old 12-18-2009, 05:57 AM   #6
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the 6l has 95k miles on it. ive never heard it run. i bought it with the intention of tearing it down and building it.
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2000 GMC Sierra Z71 5.3
Flex-a-lite electric fans, 160 degree stat 3in hooker Aerochamber, cutout, pacesetter lt and ORY, 4l80E swap, 255LPH, 02 ls6 cam, 90mm TB, 122HH, 3.2 pulley.
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Old 12-18-2009, 06:31 AM   #7
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Quote:
Originally Posted by SimpleManLance View Post
thanks for the reply. what times do you run with out the 75 shot?
It has run low 12's. Hope to get into the 11's this weekend with the cooler weather.
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Old 12-18-2009, 08:35 AM   #8
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Quote:
Originally Posted by SimpleManLance View Post
i have a 03 6L that i want to use as a base for this motor. what would you do to the motor? cam? forged rods, pistons? what brand? this would deffently have to be a buget build $2-2500 limit for the long block.

i figure 10psi should be good enough to stay away from belt slip issues, and heat problems. and if i feel the need for more power i will spray a 75 shot.

i figure i would spin the motor up to 6k max and just try and make as much power up till then.

how would you build this motor and why?
your going to eat up 2-2.5k fast doing things right even on a budget build. I don't see it happening for that $$ amount. I would save more money and run the stock motor until it pops

I would contact local engine builders and see what they are willing to do, get some estimates, make sure they know what they're doing, make sure they are reputable. Anyone not local to you would obviously add shipping $$.
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Old 12-18-2009, 08:49 AM   #9
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2000- 2500 will get you half a short block. If i were you ide get a good set of heads and cam and run it on you stock short block
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