Correction the motor is a 10 to 1 on the compression.
Mark is so busy he only has time to port heads for his motors. He Does do valve jobs on ocasion. My 454 made 557 with 049s with Marks valve job and my port work without the best tune. My poor tuning, not Marks. I'm trying to sell the motor.I've got a couple of sets of these heads, what does he charge to do a set?