I have a question on larger valves and porting. It seems to me, that it would be wise to do the porting before machining for the larger valves to prevent damage to the new seats. However isn't there going to be a big step at some point after machining for larger valves? I realize they can/should machine beyond the seat angle with a steeper angle cutter (3 angle valve job), but won't there still be a step at some point where the machining stops? Also don't you want to unshroud the new larger valves in the chamber? Can all this be estimated carefully? Do you do some before and some after? If you do some after, what is a good way to protect the newly machined seats?