We recently featured new Big Bore kits from Revolution Performance for Harley's Street models that take the bore of the 500 to 550 and the 750 to 800.
Seen here from the Plymouth, Wisconsin manufacturer is a sleeve-free 107 inch Big Bore kit for Big Twins that includes Wiseco forged pistons with wrist pins, circlips, high-performance head and base gaskets and rings that have been specifically optimized for compatibility with Revolution Performance's cylinders.
They are manufactured in aerospace-grade all-aluminum with nickel-silicon-carbide electroplated bores (hence, no sleeves required) that allow larger bore sizes with less friction for greater durability, improved horsepower and lower temperatures.
Described as providing "monster power in a package that's tested, reliable and, most importantly, really big", they are finished black with highlighted fins.
DRAG SPECIALTIES
www.dragspecialties.com