S&S CYCLE Engine Case - +4.000" Bore - Special Application - Evolution Big Twin 31-0047 Motorcycle Tires - Off Road Kits include all required bearings

Kits include all required bearings

S&S recommends that adjustable pushrod/cover kit to be used

8:1 for the ultimate in street performance

Cover is clearanced for the use of a large throw-out bearing and the kicker shaft bushing

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

S&S CYCLE Engine Case - +4.000" Bore - Special Application - Evolution Big Twin 31-0047 Motorcycle Tires - Off Road Kits include all required bearingsEngine 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