Melling 22426 GM LS Hydraulic Roller Camshaft .625/.610 Lift 227/231 Duration Class IV

The Melling 22426 is a Class IV hydraulic roller camshaft engineered for GM LS Gen III and Gen IV engines seeking serious mid-to-high RPM performance gains. With aggressive intake and exhaust profiles, this camshaft delivers strong power through the mid and upper RPM range, making it an ideal upgrade for dedicated street/strip and competition builds.

Camshaft Specifications:

• Camshaft Type: Hydraulic Roller
• Performance Class: Class IV
• Intake Valve Lift: 0.625 in. (with 1.7:1 rocker arm ratio)
• Exhaust Valve Lift: 0.610 in. (with 1.7:1 rocker arm ratio)
• Intake Duration @ 0.050 in. Lift: 227°
• Exhaust Duration @ 0.050 in. Lift: 231°
• Advertised Exhaust Duration: 285°
• Exhaust Cam Lift: 0.358 in.
• Rocker Arm Ratio: 1.7:1
• Operating RPM Range: 2,400–6,000 RPM
• Camshaft Style: 3-Bolt, Non-AFM, Non-VVT

Class IV Performance Notes:

• Designed for serious performance and racing applications
• Delivers strong mid-to-high RPM torque and horsepower
• Produces a pronounced, aggressive idle
• Requires a high-stall torque converter when used with an automatic transmission
• Will not generate sufficient vacuum for power accessories — upgrades may be required
• Exhaust system and fuel system upgrades are strongly recommended
• An ECU tune is required after installation

Melling high-performance camshafts are developed, engineered, tested, and manufactured to the highest standards of quality and materials. Always install new hydraulic roller lifters when installing a new camshaft to ensure proper break-in and maximum longevity.