Crower 74726B Features:

Crower 74726B billet steel shaft-mount rocker system for Big Block Chevy with Dart Pro1 20° 440 cc aluminum cylinder heads Features 1-piece intake stands that tie the intake side together to act like a stabilizing girdle for added valvetrain rigidity Precision-machined from solid billet steel blanks with a standard 1.850 ratio for severe cylinder pressure and racing use Designed for high-stress and blown applications while fitting these cylinder heads without requiring custom machine work

Billet Shaft Rockers Dart Pro1 20° 440Cc Bb Chev Features:

• Billet steel shaft-mount rockers for Big Block Chevy with Dart Pro1 20° 440 cc aluminum cylinder heads
• 1-piece intake stands act as a stabilizing girdle for added valvetrain rigidity, strength, and improved head stability
• Standard 1.850 ratio design for precise valve motion in high-stress, severe-cylinder-pressure, and blown racing applications
• Precision-machined from solid billet blanks to handle severe cylinder pressure without requiring custom machine work
• Optional EnduraMax needle-bearing tip upgrade helps reduce friction, minimize valve stem wear, and support smoother operation