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LQ9 or LQ4

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Old Mar 27, 2009 | 09:49 AM
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Default LQ9 or LQ4
What is the difference between the two? Which Is better? I tried the search but no dice.
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Old Mar 27, 2009 | 09:59 AM
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The biggest difference is the compression ratio lq4 is lower than the lq9. Someone will chime in on what they are since I have forgotten what they are. I think the lq4 is 9.3 or something close to that.
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Old Mar 27, 2009 | 10:04 AM
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According to Will Handzel, the main difference is pistons. LQ9 got coated skirts and 10.1:1 flat-tops versus the LQ4 at 9.4:1 circular-dish, uncoated.
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Old Mar 27, 2009 | 10:07 AM
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^ Werd. Thats what Ive heard.
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Old Mar 27, 2009 | 11:40 AM
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so both blocks rods cranks are the same? minus the 99-00 lq4 cranks which wont bolt to the t56 and 4l60?
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Old Mar 27, 2009 | 01:17 PM
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the crank reluctor wheel are different... lq4 has a 24x and the lq9 has a 58x
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Old Mar 28, 2009 | 01:50 AM
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So who here has a stock bottom 6.0 or l92 in their f body?
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Old Mar 28, 2009 | 01:53 AM
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the only diffrence is the heads the lq4 has lower compression and the lq9 has higher compression but its the same block
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Old Mar 28, 2009 | 02:43 AM
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Originally Posted by 1bdtrk
So who here has a stock bottom 6.0 or l92 in their f body?
I do...

basically the differences have been mentioned already...

the LQ4 pistons are dished for lower compression... ideal for boosted applications

the LQ9 are flat topped... better for NA cars

both are iron blocks


in my case i have an LQ4, but I milled my heads to raise my compression back up.
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Old Mar 28, 2009 | 02:57 AM
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Originally Posted by Soul TKR
I do...

basically the differences have been mentioned already...

the LQ4 pistons are dished for lower compression... ideal for boosted applications

the LQ9 are flat topped... better for NA cars

both are iron blocks


in my case i have an LQ4, but I milled my heads to raise my compression back up.



did u like ur 6.0 better than ur ls1 motor?
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Old Mar 28, 2009 | 04:41 AM
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Originally Posted by Soul TKR
I do...

basically the differences have been mentioned already...

the LQ4 pistons are dished for lower compression... ideal for boosted applications

the LQ9 are flat topped... better for NA cars

both are iron blocks


in my case i have an LQ4, but I milled my heads to raise my compression back up.

what H/C/I combo you using? hp/tq? You like it better?
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Old Mar 28, 2009 | 04:24 PM
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So a 2002 LQ9 will mate with a T56? And what crank would you need to buy to go back to the 24x reluctor? Will any aftermarket cranks work?
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Old Mar 28, 2009 | 04:33 PM
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And what heads could you bolt onto one of these? Could you bolt LS3 or LS7 heads onto a LQ9?
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Old Mar 28, 2009 | 04:38 PM
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Originally Posted by 99LS6SS
So a 2002 LQ9 will mate with a T56? And what crank would you need to buy to go back to the 24x reluctor? Will any aftermarket cranks work?
lq9 24x as well. ive come across a few lq9 and none had 58x.
all 24x. there may be some 06+ that may have 58x.
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Old Mar 28, 2009 | 04:41 PM
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Originally Posted by 99LS6SS
And what heads could you bolt onto one of these? Could you bolt LS3 or LS7 heads onto a LQ9?
negative on ls7, ls3/l92 will work
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Old Mar 28, 2009 | 04:47 PM
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Why won't the LS7's work? Sorry these might seem like dumb questions but I've never delt with an LS7
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Old Mar 28, 2009 | 05:15 PM
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Originally Posted by 99LS6SS
Why won't the LS7's work? Sorry these might seem like dumb questions but I've never delt with an LS7
The LS7 changed the degree of the heads as compared with the other LS motors. I dont remember the exact angle but that is why.
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Old Mar 28, 2009 | 07:08 PM
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Originally Posted by ssick1
did u like ur 6.0 better than ur ls1 motor?
no contest... I LOVE the 6.0, there's no reason not to lol

the bigger engine helps raise that TQ curve throughout more of the rpm range...

Originally Posted by 1bdtrk
what H/C/I combo you using? hp/tq? You like it better?
My mods are in my sig and on my sig pic... I like it MUCH better... really powerful!
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Old Nov 10, 2010 | 10:07 PM
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I am about to put a lq4 in my car is there a differnce in the trans or will the t56 bolt up?
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Old Jan 28, 2012 | 06:50 PM
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Can Both Of The Bottom Ends Handle The Same Amount Of Power?
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