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Old 06-18-2018, 05:48 PM   #1
snakedoc
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Need help with lq4 heads for turbo setup

Hello all. I have an lq4 that I bought a while back. It’s a 6.0 LQ4 engine with dished pistons. Replaced the heads with 4.8/5.3 heads. Installed a Stage 2 cam (224/234@.050 .612/638 Lift, 115 degree LSA), high lift dual spring valve springs and hardened pushrods. At the time it was built, I wasn’t thinking about any sort of turbo. And of course, now I want to turbo it. From my understanding (these forums), the 5.3 heads make the compression too high to turbo on pump gas. What head setup would any of you recommend for my turbo application? And would I be able to use the springs and the hardened push rods for the setup you are recommending?

Thanks in advance
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Old 06-18-2018, 05:52 PM   #2
snakedoc
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Re: Need help with lq4 heads for turbo setup

And this is all going in my 72 C10 FYI.
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Old 06-18-2018, 07:05 PM   #3
CheyenneSuper72
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Re: Need help with lq4 heads for turbo setup

I see lots of people with forced induction using 317 gm heads. You should be able to use all of your existing parts.
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Old 06-18-2018, 07:38 PM   #4
NC_John
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Re: Need help with lq4 heads for turbo setup

Quote:
Originally Posted by CheyenneSuper72 View Post
I see lots of people with forced induction using 317 gm heads. You should be able to use all of your existing parts.
Yeah. The 317's are pretty much identical to the 243/799's except with the lower compression. I had a set of 243's built to the max by Advanced Induction for my NA 6.7 (6.0 stroker) but kept the 317's just for that reason. Might want to boost it later too.
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Old 06-18-2018, 11:02 PM   #5
Trackman101
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Re: Need help with lq4 heads for turbo setup

you'll be fine. Just don't get greedy with the timing.
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Old 06-19-2018, 12:05 AM   #6
snakedoc
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Re: Need help with lq4 heads for turbo setup

Thanks. This helps a bit.
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