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Pistons for lq9 w/LS3 top end

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Old 07-04-2015, 11:38 AM   #1
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Default Pistons for lq9 w/LS3 top end

There's lots of threads on this, but I can't find any specific info. Anyone have experience with forged pistons with valve reliefs in them to help with the ptv on a setup like this? If so, who'd you get them through? I don't want to lose a a bunch of compression but want to be able to run a higher lift cam. Going into an 02 TA.
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Old 07-04-2015, 04:20 PM   #2
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Old 07-04-2015, 07:36 PM   #3
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It isn't the lift that affects PTV.

Either way, Autotec pistons are nice and priced well for a custom piston. I have -3cc reliefs on my 404.
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Old 07-05-2015, 12:45 PM   #4
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Originally Posted by cav101 View Post
There's lots of threads on this, but I can't find any specific info. Anyone have experience with forged pistons with valve reliefs in them to help with the ptv on a setup like this? If so, who'd you get them through? I don't want to lose a a bunch of compression but want to be able to run a higher lift cam. Going into an 02 TA.
I had a set of Wiseco's ProTru pistons that I really liked. They had valve reliefs and a small dome so you could get some decent compression with the large LS3 chambers. They're meant for stock rods though, so you would need those or a stock length (6.100") aftermarket rod.
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Old 03-16-2017, 07:03 AM   #5
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I had a set of Wiseco's ProTru pistons that I really liked. They had valve reliefs and a small dome so you could get some decent compression with the large LS3 chambers. They're meant for stock rods though, so you would need those or a stock length (6.100") aftermarket rod.
Will the pro true pistons work on an lq4 with ls3 heads?
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Old 03-16-2017, 08:28 AM   #6
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Will the pro true pistons work on an lq4 with ls3 heads?
Yeah, that's why I suggested them. The LQ4 and LQ9 are essentially the same except for pistons.
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Old 03-16-2017, 08:35 AM   #7
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Yeah, that's why I suggested them. The LQ4 and LQ9 are essentially the same except for pistons.
Thank you, do you know what compression I would be looking at? Lq4 ls3 heads and those pro true pistons? Small dome, stock stroke and bore. And can I run them on stock rods? I was planning on running them for the valve reliefs and the bump in compression. Thanks for your response!
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Old 03-16-2017, 08:59 AM   #8
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Thank you, do you know what compression I would be looking at? Lq4 ls3 heads and those pro true pistons? Small dome, stock stroke and bore. And can I run them on stock rods? I was planning on running them for the valve reliefs and the bump in compression. Thanks for your response!
According to Wiseco's catalog, you should be somewhere between 10.5 and 11.25:1. There are plenty of online calculators out there for you to verify for yourself or to see what different bore sizes or head gaskets do to change it.

Yes, like I already said, they are meant for stock rods. Depending on what rods you have, you will either have to have a machine shop press them in if you have the older rods, or you can assemble them yourself if you have the newer style floating pin rods.
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Old 03-17-2017, 08:21 AM   #9
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Yeah, that's why I suggested them. The LQ4 and LQ9 are essentially the same except for pistons.
Picked up an LQ block, iron 6.0, that has provisions for knock sensors on the outside of the block like a GenV. Never knew they made them that way.
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Old 03-17-2017, 08:47 AM   #10
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Picked up an LQ block, iron 6.0, that has provisions for knock sensors on the outside of the block like a GenV. Never knew they made them that way.
Yeah, there are some weird ones out there. I came across a 6.0L iron block with oil squirters machined into it.
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