ihdude

iTrader: (1)

I plan on a cam swap on my LQ4 and was wondering is it worth my time to work on the heads a little. I was thinking maybe milling .040 and 3 angle valve job at a minimum. Anything else I should consider? How much will this cost me?

2005 Silverado

iTrader: (19)

Cost can be different at everyshop, if your going to pull the heads i would do lifters too.

Here in phoenix a valve job, and some bowl work is about 400-500 and that was with milling like .010 to assure straightness.

NemeSS

iTrader: (123)

prefer 4angle valve job with 30* backcut on valves, new seals. thinner ls2 head gaskets. mill no more than .030 for correct intake to heads alignment.

ihdude

iTrader: (1)

What thickness of head gasket?

NemeSS

iTrader: (123)

LS2 is around 4.045 bore .051 compressed
so assuming your piston s around .010 protruding. will have around .041 quench area

ihdude

iTrader: (1)

How much tq/hp gains am I looking at from doing the head work?

SweetS10V8

iTrader: (4)

I would just save a little longer for a set of CNC heads from Texas Speed for $1025. You can sell your #317s for $200 or so, so the heads will only be $800ish.

They will increase your flow and compression at the same time, youll enjoy it a lot more than a valve job.

Rick_Vor

iTrader: (36)

2nd that. A lot more bang for the buck. If you keep an eye on the classified section for a used set of Patriots or WCCH's.

Rick

ihdude

iTrader: (1)

So going with the CNC ported heads, what kind of gains can I expect? I plan on a cam that focuses on low end torque.