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featuring a Ram-Air intake
a breath deflector and aero skirt (chin curtain) to reduce turbulence and fogging
easy fastening
Rolling pins reduce resistance for smoother engagement and stronger power delivery
S&S CYCLE Evolution Big Twin Engine Case with 4.000" Bore - Part 31-0047 Stands featuring a Ram-Air intakeEngine Case +4. 000" Bore Special Application Evolution Big Twin The S&S CYCLE 31 0047 engine case is engineered for high performance Evolution Big Twin motorcycles, offering a custom fit for cylinder bores up to 4. 000 inches. Crafted to accommodate larger stroke lengths of up to 5. 000 inches, this case features a moved outward cam chest by 0. 250 inches, providing enhanced clearance for performance builds. The design ensures optimal oil scavenging
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