Polaris Pro R - Includes 4340 billet crank, now featuring induction hardened timing chain gear, 78mm stroke, BC ProH2K rods (4.915" c-to-c), custom CP pistons (choice of bore/compression).
93mm bore = 2.13L, 94mm = 2.165L, 96mm = 2.26L
| Crank # | BC5917 - 78mm |
| Rod # | BC6915 - 4.915" |
| Piston # | BC7915 - Custom |