Steel 95.00mm stroke semi counter weighted crankshaft, comes with std 6 bolt flange and std nose to accept all factory parts. Steel "H" section conrods come with bronze bushed small ends and ARP 2000 bolts. Pistons give approx 12.5:1cr up to 13.8:1 with machined head and suitably sized valve pockets for ST170 head fitment. Available with either 85mm / 85.5mm or 86.00mm bore. (2156cc to 2207cc) All bearings supplied to assemble.