Head port and a serdi valve job matched to a cam with a nice exhaust, add a dash of compression and serve hot. voila. 

Some of the worst valve jobs I have had to re-do were from Serdi valve machines run by inexperienced/in a big hurry operators.  Shops buy a Serdi seat and guide machine, then advertise their valve jobs on EBay.  The operators  must assume the Serdi machines are idiot proof.  They need to check their work after they cut the seats!