LS3 Heads On LQ4 6.0 Help Needed
LS3 Heads On LQ4 6.0 Help Needed Ive got an LQ4 6.0 and ive been considering pulling the 853 cathedral heads and swapping them out for 821/823 heads and a stock intake. I was curious what I would all need to change to make this work? Any help would be much appreciated. Thanks Tommy
TECH Fanatic
Joined: Aug 2009
Posts: 1,845
Likes: 255
From: Coast of San Mateo County Between Pacifica & HMB
My .02 talk to Kip @ Cam Motion, be very honest about your goals and
Drive ability requirements and you will get the cam to make you
Happy, Very easy to get the wrong cam with LS3 heads on a 6.0.
Good Luck.
Drive ability requirements and you will get the cam to make you
Happy, Very easy to get the wrong cam with LS3 heads on a 6.0.
Good Luck.
Remember that the G8 has an LS3 top end and is a 6.0l as well. What kind of car are you putting it in. With what driveline?
Square/Rectangle LS heads are a little bit pickier when it comes to cam choice, but get it right and it'll pull from 2800-7100. At least mine does.
Square/Rectangle LS heads are a little bit pickier when it comes to cam choice, but get it right and it'll pull from 2800-7100. At least mine does.
I did an ls swap in my 68 camaro a couple years ago and im looking to upgrade it. The G8 was a 6.0 liter with ls3 heads from the factory? The cam ive got in my 6.0 currently is Comp Cam 224 224 566 566 114+4
On The Tree
Joined: May 2006
Posts: 131
Likes: 1
From: Virginia
My son has a 223/232 .616/.600 in his 09 G8 with full ported heads
I have a 230/238 .626 lift in my 06 GTO with full ported heads. Had to cut valve reliefs in the pistons on mine. Both are running Cam Motion cams.
I have a 230/238 .626 lift in my 06 GTO with full ported heads. Had to cut valve reliefs in the pistons on mine. Both are running Cam Motion cams.
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Following this one!!
I put some ported L92's (milled .025) and a LS3 intake (w/NW92mmTB) on a stock LQ4 and it under performed IMHO. Cam 231/247 .617/.624 @ 113.
It made 426/383 through a stalled 4L60/10 bolt @ 3.42 gears. Pretty sure the lack of compression on those dish pistons is part of the problem
I'm convinced some good cathedrals and more compression would have done better.
The existing cam/head should really like the nitrous though!!
I put some ported L92's (milled .025) and a LS3 intake (w/NW92mmTB) on a stock LQ4 and it under performed IMHO. Cam 231/247 .617/.624 @ 113.
It made 426/383 through a stalled 4L60/10 bolt @ 3.42 gears. Pretty sure the lack of compression on those dish pistons is part of the problem
I'm convinced some good cathedrals and more compression would have done better.
The existing cam/head should really like the nitrous though!!
This motor/cam combo definitely needs more compression!!
Last edited by ragtopz28; Jan 5, 2017 at 04:47 PM.
