LQ4 piston swap
03-18-2019, 05:12 AM
#1
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LQ4 piston swap i just picked up a 2006 LQ4 and when I opened it up it had the LY6 pistons with exhaust reliefs. I am building the motor for a 2dr 4wd Tahoe swap. I was thinking of picking up some Square port heads and intake but wanna raise the CR too get the extra torque down low. I don’t see myself going FI in the future as I already have a Turbo car. If I swap the LY6 dished pistons to LS2 flat tops do I have to balance again. Is the weight that much difference being that I already have the gen 4 rods and wrist pins. I won’t be spinning this trucks rpm to the roof. Just wanna a torquey fun truck that won’t see any trailer towing at all. Should I jus leave the pistons mill the heads and run a thinner gasket ?
03-18-2019, 11:02 AM
#2
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Get the LQ9 pistons. Drop-in swap and your compression will go up
03-18-2019, 01:19 PM
#4
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The LQ4 pistons are dished 6.7 cc's and the LQ9 pistons are flat tops. Compression will go from 9.4:1 to 10:1. It should still be able to use regular gas
03-18-2019, 01:30 PM
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03-18-2019, 01:46 PM
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The LS3 heads are down 1 cc from the LQ9 heads so the compression might go up another tenth of a point to about 10.2:1, being that LQ9's already have 10.1:1
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03-18-2019, 04:54 PM
#8
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