317's + ms4 = I dont know!
 

I pick up a set of low mi 317 6.0 truck heads cheap. I was told I could mill these heads .030" and still run the ms4 cam w/o clearance issues. Is this true? If so what head gaskets should i use? I know I could fly cut but I dont really want to if it's not a must. soooo what do ya think?

They'll probably cause piston to valve interference if you plan on using stock pistons. What engine do you have?

definately dont try that, it wont clear at all!

sorry... it's a 01 maro ls1 stock internals. Can those heads be used with that cam?or is it worth it? I bought them b/c they had the same porting as the 243's but just had bigger chambers. I thought they could be milled back down and would work fine. so is this not true?:bang:

Matt doesn't know what he's talking about. It will be fine! DO IT or you're a pussy!!!

Sell those heads to someone with forced induction.

haha na i dont think i'm going to take a chance... I needed good reason to buy new heads anyhow. whats another 1500-2000 dollars anyway!:D

i run the 317's milled .40 and 257/266 cam course i have -8cc pistons though

IIRC, the MS4 on STOCK heads has .060"-.065" piston to valve clearance on the intake side. Mill them .030" and it's not going to be pretty! I'd go with a set of our stage 1 LS6 heads and have a blast with it!

Pfft. Sounds like a bunch of Washington math to me. :eyes: Matt's just jealous because he doesn't want your car to be quicker than his. Run the heads and video tape the startup!