Looking to up the compression on my lq4. I have a set of 5.3 heads looking at installing bigger valves and porting them. What will this put my compression ratio at looking at running the eps single plane cam. How far can I shave these heads before I will have ptv clearance issues??? FYI I'm running the victor jr. intake carb setup thanks in advance

 

someones gotta have an idea????

 

I would find one of those compression ratio calculators on the web and assemble the various measuements it requires.