Went Big Bore...have a complete M7 top end including cylinders, pistons and RKT head with 14:1 domes. Asking $700obo. Also have the power valves and servo for sale $150 for APVS, cables and servo.
This works out to a guy paying $200 ($400new) for the head and $250 for each jug and piston....This stuff has approx. 1000 miles on it...all in great condition. A guy could bolt it onto a 600.