370 LQ4, Build Questions
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Teching In
Joined: Feb 2006
Posts: 46
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From: South Dakota
370 LQ4, Build Questions I have a LQ4 I am currently tearing down and getting ready for the machine shop. I had some questions on a couple of the parts to order. The car is a weekend driver and will see the drag strip a couple times a year.
I'm most likely using Wiesco flat top pistons (-3.2cc 4.030) and 799 heads that been milled .003" and a valve job. The reason I only had them milled .003" is because I was originally using them for a stock ls1 but the build went a different direction. Do I have more milled off of them to bump compression? Also using K1 H-Beam rods (6.125"). The cam is a BTR stage 4, with all the supporting mods (pushrods, LS7 lifters, BRT dual springs, comp cams trunion bearing upgrade, milling oil pump, slp double-rolling timing chain).
What head gaskets do you recommend?
What size injectors? I may run nitrous in the future, but not this year. Leaning towards the 42 lb. Racetronix. Or do you recommend anything else?
Sorry for all the questions, first build so I want to make sure I'm doing it right before I spend even more money. Thank you in advance.
I'm most likely using Wiesco flat top pistons (-3.2cc 4.030) and 799 heads that been milled .003" and a valve job. The reason I only had them milled .003" is because I was originally using them for a stock ls1 but the build went a different direction. Do I have more milled off of them to bump compression? Also using K1 H-Beam rods (6.125"). The cam is a BTR stage 4, with all the supporting mods (pushrods, LS7 lifters, BRT dual springs, comp cams trunion bearing upgrade, milling oil pump, slp double-rolling timing chain).
What head gaskets do you recommend?
What size injectors? I may run nitrous in the future, but not this year. Leaning towards the 42 lb. Racetronix. Or do you recommend anything else?
Sorry for all the questions, first build so I want to make sure I'm doing it right before I spend even more money. Thank you in advance.
You may have to wait until the short block is assembled to determine the head gasket thickness you'll need, so that can be delayed for a later time. Get connected to a very reputable machinist/shop and they will help you to decide the many questions you have.
42' s are perfect, use a Bronze bushing trunion kit, is that cam ok for stock rockers?
42' s are perfect, use a Bronze bushing trunion kit, is that cam ok for stock rockers?
TECH Senior Member
Joined: Jun 2016
Posts: 22,298
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From: Central Cal.
The BTR Stage IV will be testing the stock rockers with as much lift as that cam has. Much over .600 makes the rockers scrub the valve tips.
Also, you might consider using a bronze bushing upgrade rather than the Comp one, as the trunnions are showing premature wear in many cases. Just a heads-up....
Also, you might consider using a bronze bushing upgrade rather than the Comp one, as the trunnions are showing premature wear in many cases. Just a heads-up....
