Simply put, Zcams' function like a much 'bigger' cam (greater duration) yet they increase low-end and mid-range torque in the most often used rpm range. All Zcam profile increases the rate of acceleration during the cycle in which the valve is opening and as it approaches maximum valve lift. At max lift the Zcam then returns the valve to its seat, but only after maximum flow and cylinder filling has been achieved.

Peak horsepower and torque output are enhanced throughout the entire rpm range! New Crane Zcams' were also designed to minimize horsepower-robbing harmonic frequency pulses when matched with the recommended valve springs.

CRANE CAMS® Z-cams™ Hemi Camshaft
- Stage I - Hydraulic Roller
• 1000-5500 RPM Operating Range
• Works Well With Stock Computer
• Exellent Torque throughout RPM Range, Smooth Idle
• Net power increases up to 30 +HP

CRANE CAMS® Z-cams™ Hemi Camshaft
- Stage II - Hydraulic Roller
• 1500-5800 RPM Operating Range
• Works With Stock Computer (upgrade tuning for best results)
• Very Strong MID-RANGE, Noticeable Idle
• Net power increases up to 40 +HP

CRANE CAMS® Z-cams™ Hemi Camshaft
- Stage III - Hydraulic Roller
• 2000-6200 RPM Operating Range
• Needs Extended Rev Limeter
• Requires Improved Exhaust System
• Strong Power over 2500 RPM Range, Noticeable Idle
• Computer upgrade tuning required for best results
• Net power increases up to 60 +HP