BC has developed the ultimate CNC cylinder head package that features maximum flow intake and exhaust port design and combustion chamber enhancements along with complete BC valve train components and high performance camshafts. Each cylinder head includes complete 5 axis CNC porting of the intake and exhaust ports as well as CNC milling of the combustion chamber to equalize burn rate, reduce variance in compression ratio and eliminate potential hot spots in the chamber. BC offers two different port designs, a small port design featuring standard intake (29mm) and exhaust valves (25mm), typically for non stroker applications and a big port with +1mm intake and +1mm exhaust valves for the larger displacement stroker engines or hardcore duner or race engines.

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BC offers two options for the Can-Am X3/Rotax 900 crankcases. The Darton MID (Modular Integrated Deck) features a cast iron sleeve which when siamesed and nested, creates a solid deck of sleeve flanges held in tension, reinforcing the upper deck area and provides for in-field replacement. Available in 74, 75 and 76mm bore sizes. Or choose from the Cylinder Support System (CSS) closed deck process which is a proven technique for strengthening X3 open deck blocks using the factory liners.The CSS option is only available in 75mm bore, Both the Darton and CSS case process from BC includes the following:

• Finish hone to piston bore size.
• Copper O-Rings to contain combustion.
• Drill/tap for BC coarse thread head studs.
• ARP 7/16" > 10mm 625+ head studs.
• Cometic MLS head gasket for O-Rings.

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