Includes premium steel EN40 billet crank, stock 92.8mm stroke. Crank is heavy metal rough balanced to 1455g bobweight. Also features BC ProH625+ rods (154mm c-to-c) and custom pistons (choice of bore/compression). Note: Custom pistons are currently running 6-8 weeks, you specify desired bore/compression ratio. The crankshaft requires internal balancing and the ATI Super Damper #918659 - do not reuse the OEM external damper.