Crower 74184B Features:

Billet shaft rocker system for SBC Dart 9° heads with 4.400 in. bore spacing 1.650 rocker ratio with .650 in. intake offset and .250 in. exhaust offset CNC-machined ball-race alloy steel shafts, double heat-treated and micro-finish ground Fully rollerized needle-bearing fulcrum with hardened tip wheels and super-secured axles

Billet Shaft Rockers Sb C Dart 9° Heads, 4.400 Features:

• 1.650 ratio with 0.650 in. intake offset for Dart 9° SBC geometry and accurate valve motion under high-rpm load
• 0.250 in. exhaust offset matched to 4.400 in. bore spacing for proper rocker alignment and valvetrain clearance
• CNC-machined ball-race alloy steel shafts, double heat-treated and micro-finish ground for rigidity and reduced deflection
• Fully rollerized needle-bearing fulcrum, hardened tip wheels, and super-secured axles for lower friction and race-ready reliability
• Aircraft-alloy lash adjusters with precision thread-rolled, double heat-treated construction for stable lash control and easier service