Quote Originally Posted by JDMBeau

to make this more of a technical discussion, mike, i was looking around on h-t and there is a thread on mixed opinions about lapping the valves, some say it is necessary some say, it is a age old trait that not all people do it, does it just REDUCE the chance of blowby, or completely elimate the chance of it?
it most certainly HAS TO BE DONE if you care about your motor.

Jim Justice does it
Don Flores does it
David Hsu does it

im not one to disagree with those people