going to the dark side *engine is in*
If they torque the rods down in a rod vice and the big ends are out they can't pull the caps and shave the flats and re hone like the old SBC rods since these are cracked caps...
So what they do is punch them out .002 and they make a special bearing for the LS crack cap rods that makes up for it....
this is very common when switching to ARP hardware and changing the clamping load and distorting the big end...
Yes the LQ4 is dished.... the LQ9 has flat pistons...
What CC chamber are the heads you are using...
These motors come with a -.005 piston compression height (piston is out of the bore a little) and you wanna keep your quench in the ~40s so if you can tell me what cc head you have I can tell you what you compression will be...
Stock LQ4 is 9.4:1 I believe with a 6cc dish
So what they do is punch them out .002 and they make a special bearing for the LS crack cap rods that makes up for it....
this is very common when switching to ARP hardware and changing the clamping load and distorting the big end...
Yes the LQ4 is dished.... the LQ9 has flat pistons...
What CC chamber are the heads you are using...
These motors come with a -.005 piston compression height (piston is out of the bore a little) and you wanna keep your quench in the ~40s so if you can tell me what cc head you have I can tell you what you compression will be...
Stock LQ4 is 9.4:1 I believe with a 6cc dish
The LS2 rods look WAY beefier compared to the LQ4 rods and have floating pins.
Milling .030 of the heads should give you around 10.6:1 CR
LS2 rods/pistons are about 125-250 for a set and yield 10.9:1.
Last edited by 93Z2871805; Jul 22, 2011 at 12:23 AM.
Before I fell and hit my head and I was gonna use LS2 rods I put ARP bolts in them and had my machine shop check them and they were fine and didn't need to be touched...
As for your compression
4.000 bore
.051 crush head gasket
-.005 deck height
3.662 stroke
decking .030 puts you at ~65 cc
LQ4 pistons have a ~7 cc dish
So your compression with the LQ4 pistons would be - ~10.2
or 11.09 with LQ9 Flat tops
Also all the floating pin rods are the same as the LS2 rods and are stronger than the pressed rods
As for your compression
4.000 bore
.051 crush head gasket
-.005 deck height
3.662 stroke
decking .030 puts you at ~65 cc
LQ4 pistons have a ~7 cc dish
So your compression with the LQ4 pistons would be - ~10.2
or 11.09 with LQ9 Flat tops
Also all the floating pin rods are the same as the LS2 rods and are stronger than the pressed rods
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Verdad Gallardo As for the 64cc there is no way to know for sure what his Head CC will be without him having them checked at the machine shop since these heads vary a lot from the factory...from 68-71
but I am picking up what your puttin down kenny.....
never really looked into it but I would rock the 317s on the 6.0 then when you get ready throw the ls3s on it
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wont be going cathedral, waste of time/money if im going to go ls3 later on. right now the build is on hold till i sell the lt1 stuff... i bought that stuff then a week later bought the lq4 
i juet couldnt resist it. more power cheaper.
i juet couldnt resist it. more power cheaper. 