Melling 22425 Class IV Hydraulic Roller Billet Camshaft GM LS Gen III/IV 0.625/0.625 Lift 230/244 Duration

The Melling 22425 is a Class IV High-Performance Hydraulic Roller Billet Camshaft engineered for GM Gen III and Gen IV LS engines equipped with a 3-bolt cam gear and without Active Fuel Management (AFM/DOD). With an aggressive specification profile, this camshaft is purpose-built for serious street/strip and competition applications demanding strong mid-to-high RPM power output.

Camshaft Specifications:

• Cam Style: Hydraulic Roller
• Cam Class: Class IV
• Intake Duration @ 0.050" Lift: 230°
• Exhaust Duration @ 0.050" Lift: 244°
• Intake Valve Lift: 0.625 in.
• Exhaust Valve Lift: 0.625 in.
• Lobe Separation Angle (LSA): 113°
• Operating RPM Range: 2,000–6,000 RPM
• Cam Gear Attachment: 3-Bolt
• AFM/DOD Compatible: No (Non-AFM engines only)
• VVT Compatible: No (Non-VVT engines only)
• Construction: Billet steel

Class IV Performance Profile:

• Designed for serious racing and high-performance street/strip builds
• Delivers strong mid-to-high RPM torque and horsepower
• Produces a rough, aggressive idle character
• Best suited for manual transmissions or automatic transmissions with a very high stall converter
• Requires proper rear axle ratio selection for optimal performance
• Benefits from supporting upgrades including headers, upgraded fuel system, and exhaust improvements

Melling high-performance camshafts are developed, engineered, tested, and manufactured to exacting standards of quality and materials, making the 22425 a reliable foundation for any serious GM LS performance build.