Intro to a port job

famous bob said
Not good for performance , I`m sure you`ve done a before and after on a flow bench , those are killers for flow.
My buddy is a great head man (ex 18 time national record holder) and has a state of the art valve/head machine , I saw personally the diff , between that lip , about the size of a clipped heavy fingernail on the flow bench , then w/o it , was almost unbelieveable.
I wouldn`t let anyone use stones for a valve job anymore .-----On any head of mine.. I guess a stock engine type build would be all right for some uses tho.
Just me .

People might say the same about you .lol
Just kidding ya. That's fine. To each his own. Everything is specific, you can get carried away ,open too much of the chamber side around the exhaust and screw **** up. Nothing wrong with stones, if you know what you're doing and check your work. Honest to God truth I've had more bad valve jobs done with a serdi than stone. Chattered by an elephant operating the arm.