MK136 Black Edition Engine - 550G Gear Drive - Oil Cooled - Race Only - M8 Touring D604 Each hidden breather is o-ringed

Each hidden breather is o-ringed at the heads and exits at the mouth of the injector/carb to provide efficient engine breathing

Big Sucker Air Cleaner Kit - Natural - Stage I

Works well in all size motors up to 10:1 compression

Rapid grease shedding formula

MK136 Black Edition Engine - 550G Gear Drive - Oil Cooled - Race Only - M8 Touring D604 Each hidden breather is o-ringedMK136 Black Edition Engine 550G Gear Drive Oil Cooled Race Only M8 Touring Cylinder Heads: High flow cylinder heads with premium seats, guides, valves, springs, and seals =+1. 00 mm oversized intake and exhaust valves Valves are 0. 030" longer than stock for improved valvetrain geometry 0. 605" max lift valve spring 550G gear drive cam Enlarged cooling passage around the exhaust seats S&S exclusive breather boxes Crankcase: Patented dual spray piston