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Generation III Internal Engine
1997-2006 LS1 | LS6
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Old 10-07-2004, 11:30 AM   #1
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Default SLP 402 LQ6 iron block, should I go with LQ9 heads or LS6 heads?

What heads to go with for the 402 LQ9? I want as much power as possible with this motor
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Old 10-07-2004, 11:53 AM   #2
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LQ9 for FI & LS6 for N/A.
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Old 10-07-2004, 11:54 AM   #3
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I beleive LQ9 have a bigger combustion chamber. ls6s have a smaller combustion chamber. 71cc compared to 63.5cc or something like that but dont quote me on that. so depends on what compression you want to go with.
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Old 10-07-2004, 12:00 PM   #4
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I will be spraying a 200 shot, looking for 11:1 compression
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Old 10-07-2004, 03:56 PM   #5
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you'll gain .8 compression over the LQ4/LQ9 heads with the 64.45cc Ls6 heads
thats if your got the LQ9 engine with the 345hp with the flat top pistons
looking at 10.8 with ls6 at 64.4cc
and 10.0 with stock heads LQ9/LQ4 at 71.0cc
also 10.5 with LS1 heads at 66.67cc

the LQ and LS6 heads are the same except for chamber size
LS1 have smaller port volume size as well as differnet chamber size

LS6/LQ in210cc/exh75cc
LS1 in200cc/exh70

I hope i got all that right.

My Bad I forgot we were talking about the 402CI ZL from SLP . yaeh i dont know the piston from deck height to figure out the compression on the motor, b/c of the none stock setup. i know you can get the 11.3 and the 9.5 engines but with what heads that make those compression number i dont know
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Old 10-07-2004, 04:03 PM   #6
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Hey MeanWS6, it seems that you will be the first to go with the SLP 402. Keep us posted with the progress/results. After what I have read here, it looks like a good package for 3600.
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Old 10-07-2004, 04:23 PM   #7
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Quote:
Originally Posted by Blue Hawk
Hey MeanWS6, it seems that you will be the first to go with the SLP 402. Keep us posted with the progress/results. After what I have read here, it looks like a good package for 3600.
Yea, probably. I just want to make sure I have everything sorted out before I pull the trigger on it. I am also doing a TH400 swap, and of course more spray. It would be nice to put a 'vert in the low 10's or high nines.
Speed Inc will be doing all of the work, I will see what they have to say also and let everyone know.

I know SLP used the Stage III LS6 heads and a huge cam on the dyno
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Old 10-07-2004, 04:49 PM   #8
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Old 10-07-2004, 05:46 PM   #9
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I'm installing the SLP 402 with AFRs next week. SLP claims 11.3 to 1 with 63.5cc. I've got the AFRs milled for 60cc.
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Old 10-12-2004, 12:54 PM   #10
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i have the iron block 6.0 and im gonna stroke it to a 408 i wanna go twin turbocharged so i been told the 6.0 truck heads is the ones i want what is the part number to those heads so i know what to look for when this guy have me come look at his heads he said are the ones off the 6.0 and how well do those heads flow with some professional porting and bigger valves n all . put it in simple terms is working with them heads worth it im l;ooking to run low 10's or high 9's
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Old 10-12-2004, 02:02 PM   #11
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part number: 12572035

I found two casting numbers, casting number should be either 317 or 035 (02 and up LQ9 6.0 aluminum heads)

Specs:

LQ9
01+ 6.0L Truck
Material: Aluminum
Combustion Chamber Volume: 71.06cc
Intake Port Volume: 210cc
Exhaust Port Volume: 75cc
Intake Valve Diameter: 2.00 inches
Exhaust Valve Diameter: 1.55 inches



Shaun @ SMC has these heads at a good price (so they said in the forums)
ValveGod@aol.com

If any other sponsors have them, PM with pricing
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Old 10-15-2004, 12:22 PM   #12
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any other suggestions guys
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Old 10-15-2004, 12:22 PM
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402, 60, block, cam, engine, gain, giant, heads, iron, lq6, lq9, ls6, slp, speed, texas


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