Mercury - Revolution 4 XP Racing Propeller - 4-Blade - 150 - 400 HP and 450R HD Gear Case Outboards Only - Sterndrive up to 600 HP - 14.6 Dia. - 20 Pitch - 48-8M0113937. The Pro Finished Mercury Racing Revolution 4 XP is offered in half-pitch increments designed to fine-tune the engine's RPM maximizing performance.. Applicable for Center Console, Bay, and work boats. Eligible for Joy Stick Piloting outboards. The Mercury Revolution 4 XP Propeller fits 150 to 400 HP and 450 HD gearcase outboards only, sterndrive up to 600 HP.