Ok guys, I'm new here but need some help. I am building a 6.0 from a 2003 truck. I am looking to get a compression ration of about 10.5:1 and need to know how much to deck the heads to get to this point and use stock head gaskets. I also need to know how much lift I can get from a cam without having piston to valve clearance issues before or after milling the heads. I am already changing the valve springs to make sure that they can handle the bigger cam. Any help will be greatly appreciated.

 

Do you know if your 6.0l engine is an LQ4 or LQ9? It makes a big difference in calculating how much to mill to raise compression.

Richard

 

i believe it is the LQ4 engine. It is out of a 2003 Silverado 2500HD

 

If you mill off .030" from the heads, your c/r will go up to approx. 10.2:1. That should allow you to run a decent sized cam without hitting the pistons. Keep the duration under 228º@.050" and under .600" lift and your going to be alright.

Good luck,

Richard

 

thanks so much for the info and the quick answer.