ACDelco 12638427 LS9 Hydraulic Roller Camshaft

The ACDelco 12638427 is the genuine GM factory hydraulic roller camshaft originally installed in the Corvette ZR1 LS9 supercharged 6.2L engine rated at 638 horsepower. This 3-bolt style camshaft is designed for Gen IV engines with the cam sensor on the timing cover, making it an excellent upgrade for LS3 and other LS-series applications.

Camshaft Specifications:

• Duration at 0.050" lift: 211° intake / 230° exhaust
• Maximum lift with 1.7 rocker: 0.562" intake / 0.588" exhaust
• 122° lobe separation angle (LSA)
• 3-bolt cam gear mounting design

Performance Benefits:

• Provides approximately 30 rear-wheel horsepower gain on naturally aspirated 6.2L LS3 engines
• Ideal for supercharged LS3 applications
• Excellent drivability with outstanding power delivery
• Optimized for forced induction with proper LSA and exhaust duration

As a GM Genuine Parts/ACDelco Original Equipment component, this camshaft is designed and engineered to meet rigorous standards set by General Motors. Compatible with all Gen IV engines when used with proper valve springs. Gen III engines require a Gen IV timing chain cover for cam position sensor compatibility.