I have a brand new in the set of 8 SRP high dome open chamber pistons, oil ring spacers & pins that are open chamber with a 4.60" bore for a big block chevy that need a 6.535" rod. they are part number #152162 and also have been factory balanced. here are factory from SRP.
SRP Big Block Chevy High-Compression Dome Top Pistons
Bore (in.): 4.600 in.
Rod Length: 6.535 in.
Dome, with single valve relief
forged alu. Piston
Compression Height (in.):1.245 in.
39cc Piston Head Volume
Press-fit or floating pins
Wrist Pins(.990) & oil tension rings:
uses 1/16"x 1/16"x 3/16" rings
the 1st $400 plus shipping it's them!!