Crower 74134F Features:

Crower 74134F shaft-mount rocker arm system for SBC 23° All Pro heads with 40/60 geometry and 5/8 in. shafts 17-4PH stainless steel rockers with Crower 1025 heat-treating for rigidity in dirt late model and marine endurance racing 1.480 in. arm length with .450 in. intake offset; official Crower catalog lists .175 in. exhaust offset Fully rollerized needle-bearing fulcrum, alloy steel tip rollers, oversized needle bearings, and hi-temp alloy lash adjusters

Shaft Rockers All Pro 23 40/60 5/8 In. Shafts Features:

• 17-4PH stainless steel rockers with 1025 heat-treatment, 5/8 in. shafts, high-rigidity shaft-mount design for SBC 23° All Pro 40/60 heads
• 1.480 in. arm length with .450 in. intake offset and .175 in. exhaust offset for optimized valvetrain geometry and reduced guide scrubbing
• Fully rollerized needle-bearing fulcrum with oversized premium needle bearings for lower friction, smoother motion, and improved high-rpm stability
• CNC-machined ball-race alloy steel shafts, double heat-treated and micro-finish ground for consistent support in high-heat endurance racing
• Aircraft-quality 12-point nuts, hi-temp thread-rolled lash adjusters, and alloy steel tip rollers for durability, valve control, and reduced wear