S&S CYCLE Engine Case - +4.000" Bore - Special Application - Evolution Big Twin 31-0047 Motorcycle Tires - Off Road Piston Kit - For 97"

Piston Kit - For 97" Big Bore Kit - 3

8:1 for the ultimate in street performance

000 starts without running battery down

D402 Tires are engineered and tested with Harley-Davidson

S&S CYCLE Engine Case - +4.000" Bore - Special Application - Evolution Big Twin 31-0047 Motorcycle Tires - Off Road Piston Kit - For 97"Engine Case +4. 000" Bore Special Application Evolution Big Twin Designed for high performance engines with cylinder bores 4. 000", 4. 125" and 4. 375"., Cam chest is moved outward 0. 250" to allow crankcases to handle large cylinder bore sizes, Clearanced for strokes as long as 5. 000", Relocated cam chest oil pick up increases gear case scavenging and virtually eliminates oil carry over at sustained high speeds, Machined to accept the stock oil