Crower 74135F Features:

Crower 74135F shaft-mount rocker arms for All Pro 17° Small Block Chevy cylinder heads with 5/8 in. shafts Stainless steel rocker arm construction delivers high rigidity, precise valve train accuracy, and reduced flex under stress Built for extreme racing, dirt late model, and marine endurance applications where heat resistance and long service life matter 1.650 arm length helps support stable valve timing and dependable performance in sustained high-temperature conditions

Shaft Rockers All Pro 17 5/8 In. Shafts Stainless Features:

• Stainless steel shaft-mount rocker arms for ALL PRO 17° SBC heads, built for high-heat endurance racing and reduced flex under load
• 5/8 in. shafts with 1.650 arm length for precise valve motion, improved rigidity, and more consistent valve timing accuracy
• Steel-based valvetrain strength for dirt late model and marine endurance use, resisting heat-related wear and loss of strength
• Optimized moment of inertia with rigid shaft-mounted design for stable high-rpm operation and reduced risk of component failure
• Track-side service-friendly construction for easier installation and maintenance in extreme racing applications