How much can a set of stock 317 heads be milled before the pushrods need to be shortened??? Would the length of the pushrods (or lifter preload) have any effect on HP/Trq???
I would like to boost my (mild cammed) LQ9s compression.

 

Someone must have a good idea on this.
Do I need to include more information????

 

You need to buy a push rod length checker measure your setup !!

 

You should always measure after milling the heads. You may not lose any HP but your valvetrain may self destruct itself in a short amount of time.