CUSTOMER SUPPLIED CRANKCASE - This is the hot setup for any Polaris RZR build (XPT and XP1000), especially big horsepower (over 250whp), endurance racing or anyone who's had rod or crank failure and are searching for more reliability out of their RZR engine.  You supply the crankcase (new cases available, use BC4910N) for lineboring, shuffle pinning, King main bearings and ARP2000 main studs.  The BC 4340 billet XP crankshafts are an improvement to the rod bearing failures...