Crower 74123F Features:

Crower 74123F stainless steel shaft-mount rocker system for RHS, Pro-Topline, and Pro-Action SBC 23° Iron RR cylinder heads. Heavy-duty 5/8 in. shafts deliver extreme rigidity, accurate geometry, and improved valvetrain stability for high-performance builds. Specific geometry includes 1.480 in. arm length, .450 in. intake offset, and .100 in. exhaust offset. Mounted on 020F base stands and uses replacement stand part number 74400X020F for service compatibility.

Shaft Rockers Pro Action 23° SBC 5/8 In. Shafts Features:

• Stainless steel shaft-mount rockers for RHS, Pro-Topline, and Pro-Action SBC 23° iron RR heads, optimized for high-heat durability and longer service life
• Heavy-duty 5/8 in. shafts deliver extreme rigidity, improved accuracy, and greater valvetrain stability for high-performance and track-driven applications
• 1.480 in. arm length with .450 in. intake offset and .100 in. exhaust offset for precise fitment and rocker geometry on 23° SBC cylinder heads
• Mounted on 020F base stands and compatible with replacement stand 74400X020F, supporting reliable installation and serviceability in demanding engine builds
• Optional needle-bearing roller tip upgrade helps reduce friction, free up horsepower, and minimize valve guide wear under sustained racing and marine endurance use