Crower 74709B Features:

Billet steel shaft-mounted rockers for Big Block Chevy with Dart Big M aluminum cylinder heads Includes 1-piece intake stands for added valvetrain stability and consistent rocker geometry Crower 74709B premium shaft rocker system engineered for extreme-performance BBC applications Designed specifically for Dart Big M cylinder head fitment in high-rpm racing valvetrain setups

Billet Shaft Rockers Dart Big M BBC Alum Heads Features:

• Billet steel shaft-mount rocker design for BBC Dart Big M aluminum cylinder heads, precise valvetrain geometry
• 1-piece intake stands for added rocker stability, improved alignment, reduced deflection under high-rpm loads
• Shaft-mounted valvetrain layout for consistent motion control, enhanced durability in extreme performance use
• Application-specific fit for Big Block Chevy with Dart Big M heads, streamlined installation compatibility
• Premium rocker system construction for high-load performance engines, strength-focused design, long service life