cav101

iTrader: (10)

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.

A.R. Shale Targa

iTrader: (2)

http://www.texas-speed.com/p-1106-ma...-6098-rod.aspx
4.030" size

MuhThugga

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.

KCS

iTrader: (20)

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.

AnthonyLMBD

Will the pro true pistons work on an lq4 with ls3 heads?

KCS

iTrader: (20)

Yeah, that's why I suggested them. The LQ4 and LQ9 are essentially the same except for pistons.

AnthonyLMBD

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!

KCS

iTrader: (20)

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.

64post

iTrader: (5)

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.

KCS

iTrader: (20)

Yeah, there are some weird ones out there. I came across a 6.0L iron block with oil squirters machined into it.