Crower 74183B Features:

Billet shaft rocker system for SBC Dart 9° heads with 4.500 in. bore spacing 1.650 in. arm length with 0.650 in. intake offset and 0.250 in. exhaust offset CNC-machined ball-race alloy steel shafts, double heat-treated, and micro-finish ground Fully rollerized needle-bearing fulcrums with hardened tip wheels and super-secured axles

Billet Shaft Rockers Sb C Dart 9-Degree, 4.500 In. Features:

• SBC shaft-mount rocker system for Dart 9° heads with 4.500 in. bore spacing, optimized for precise valvetrain geometry and stable high-rpm operation
• 1.650 in. arm length with 0.650 in. intake offset and 0.250 in. exhaust offset for correct rocker alignment and accurate valve motion
• CNC-machined ball-race alloy steel shafts, double heat-treated and micro-finish ground for added strength, wear resistance, and long-term durability
• Fully rollerized needle-bearing fulcrums, hardened tip wheels, and secured axles help reduce friction, minimize scrubbing, and support racing use
• Compatible with Stand ID 019F and Stand Part 74400X019F; supports needle-bearing roller tip, DLC-coated pin, or bushed valvetrain upgrades