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Old Mar 21, 2010 | 02:39 PM
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I need to replace my short block and get my car up and running asap. I located an LQ4 short block in town from an ls1tech member. It's got ~90k miles and he's asking $500, does that sound about right? Money is tight so I am trying to do this w/o spending too much.

I have done some searching and found most answers I had. What I am wondering now is should I use my existing 806 heads or buy the LQ4 heads ($150). Also will my rockers, lifters, MS3 cam, pushrods work in the LQ4? How much of a power increase can I expect assuming the only thing changing is the block and heads if they make a difference?

Thanks!
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Old Mar 21, 2010 | 02:58 PM
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That's about the average price..
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Old Mar 21, 2010 | 04:34 PM
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the lq4 piston have a dish in them so u will loose alittle compression
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Old Mar 21, 2010 | 08:29 PM
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why cant i ever find deals like this! this is exactly what i need. good luck with it! i cant find them for under 800 bucks
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Old Mar 21, 2010 | 09:09 PM
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Originally Posted by johnster
the lq4 piston have a dish in them so u will loose alittle compression
any idea how much? lower compression isn't necessarily bad tho, I can up the timing and lean it out, or run lower octane if I want.
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Old Mar 21, 2010 | 09:23 PM
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lq4 is 9.4 to 1 lq9 is 10 to 1, at least thats what i read somewhere
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Old Mar 22, 2010 | 08:45 AM
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Originally Posted by 1krr
lq4 is 9.4 to 1 lq9 is 10 to 1, at least thats what i read somewhere
Yes thats right..Lq4 uses dished pistons Lq9 uses flattop. '01 up Lq4 uses the same 317 heads as Lq9 but older that '01 used cast steel heads.
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Old Mar 22, 2010 | 10:55 AM
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So it sounds like with the same tune I'd probably make about the same power right? More displacement, less compression.

Now what about the heads, LS1 flow rates vs LQ4?
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Old Mar 22, 2010 | 11:24 AM
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LQ4 Heads are alot better than the LS1 Heads.
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