Polaris Pro R - Includes 4340 billet crank, now featuring induction hardened timing chain gear, 73.5mm stroke, BC ProH2K rods (4.915" c-to-c), shelf CP pistons (choice of bore/compression).
Stock stroke rotating assembly.
| Crank # |
BC5916 - 73.5mm |
| Rod # |
BC6915 - 4.915" |
| Piston # |
CP - Shelf |
