How to get compression up on LQ4
11-28-2007, 07:26 AM
#14
Yep, but you wil be closer to 10:1 because the stock 5.3 heads have small chambers to begin with (61 I believe). The LS6 chmabers are 64-65 so You would not gain as much compression as the 6.0l guys. Now you can mill your 5.3 heads .040" and run a .040" gasket, and you would be somewhere around 10.5. The stock gasket is about .054".
11-28-2007, 09:10 AM
#15
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Yep, but you wil be closer to 10:1 because the stock 5.3 heads have small chambers to begin with (61 I believe). The LS6 chmabers are 64-65 so You would not gain as much compression as the 6.0l guys. Now you can mill your 5.3 heads .040" and run a .040" gasket, and you would be somewhere around 10.5. The stock gasket is about .054".
11-28-2007, 08:05 PM
#17
You might want to check and see how much the pistons are sticking up out of the hole. All the LQ4's and LQ9's I have worked on were .008" to .012" up. You would not want a head gasket too thin, .035" quench is the minium I would suggest.
piston up measurement + .035" minium quench= head gasket thickness
piston up measurement + .035" minium quench= head gasket thickness
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