I have a complete set of (8) Ross 320704 pistons with Manley forged 6.535" H beam rods with ARP 2000 bolts. Setup came out of a Reher Morrison 555ci package. The set only has a few runs on them.
Ross Piston Specs:
Deg 25 Bore 4.560 CH 1.120 Net Dome CC 48.60 Dome Height .515 Gram Wt. 575g