S&S CYCLE Engine Case - +4.000" Bore - Special Application - Evolution Big Twin 31-0047 Motorcycle Tires - Off Road Forged pistons have larger than

Forged pistons have larger than stock valve pockets and accepts up to 2

000 starts without running battery down

Kits include all required bearings

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 Forged pistons have larger thanEngine 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