Heads were ported by a local old timer. As far as I know no angle valve job was done during porting. I have been running these heads for about 5 years on a mild 340. These heads have ran 11.10 with a 100 shot of NOS. The motor is now starting to use some oil and smoke. This is a street car that I drive quite a bit in the summer and take to the track 3-4 times a year. I would like to continue running low 11s without the NOS so in my openion the 4" crank is the best way to acomplish this. I belive 525 hp will get me there.