Musky, Intake valves are from the same engine that the pistons are modeled after, Think you used the same type of pistons in your A7, Think 66.6% of another model
I had Ross Pistons make up this set. The black is a hard anodize on the whole piston even under the crown. Top is coated with ceramic. Had to put new valve seats in on the intake side to accommodate the large valve, Just clears the cylinder wall. I also upgraded the through bolts this year to straight 3/8. Welded up the case barrel mouth to accommodate 1/2 steel inserts to take the 3/8 studs