is it possible to mill the stock heads and get and even better compression ratio, especially since my vq35hr runs fine on 87 octane (not that I use 87 octane on a regular basis) but if it runs fine on 87 octane, maybe there is some latitude; in terms of increasing the compresion ratio, thus getting more power, and now with this girdle style main caps. It might force me to always run 93, but thats fine with me. Off course it would be like a thousand bucks to mill the heads right and I guess that might change clearances,

IDK, I was just thinking.

 

It will give you a little more compression which would result in more power. Just check valve clearances to see how much you can mill in order to cancel the chances of a piston hitting a valve. I'm sure people on this forum have done this before

 

Right, only concern is valve to piston clearance, and since you are dealing with variable timing on both cams, there needs to be allowance for that. What clears with the motor off may not clear once it's running and advancing/retarding the cam timing.