Wiseco Forged Pistons part number K545M84 Std. Bore 8.4:1 Compression Ratio. An Authorized Master Dealer for MANLEY & WISECO. B20 Bottom End. Manley H-beam rods part number 14025-4 – one set (4 Ea) of 4340 steel connecting rods, balanced to within +/- 1 gram, and 3/8” ARP2000 rod bolts.