Wow. Great discussion! I do have the heads back and they did a 3 angle valve job. The guy also said the intake seat (I think) was only about 85% open and supposedly he opened it up more. Can anyone explain that to me? Did he likely just remove cyl head material on the inlet / upstream side of the intake seat? i.e. Unshroud it ? Does anyone know if my Edelbrock performer heads 2003 vintage (170 cc inlet runner volume) came with a 3 angle cut / valve job?