Crower 74709F Features:

Crower 74709F stainless steel shaft rocker system for BIG BLOCK CHEVY Dart Big M aluminum cylinder heads with a 1-piece intake stand design. Drop-on installation requires no machine work, making this valvetrain upgrade convenient for BBC Big M builds and service work. Premium stainless steel construction delivers extreme rigidity, accurate rocker geometry, and longer service life than aluminum alternatives. Engineered with a 1.650 pivot length and optimized geometry for valvetrain stability under high load in endurance, dirt late model, and marine use.

Shaft Rockers Dart Big M Stainless Steel BBC Big Features:

• Stainless steel shaft rockers for DART BIG M BBC aluminum heads with 1-piece intake stands and no-machine-work installation
• 1.650 pivot-length geometry optimized for BIG BLOCK CHEVY valvetrain stability, accuracy, and consistent high-rpm valve control
• Extreme-rigidity stainless steel construction for longer service life than aluminum rockers under sustained high-temperature loads
• Drop-on shaft-mount upgrade for endurance racing, dirt late model, and marine applications demanding reliable valvetrain stability
• Compatible with needle-bearing roller tip option to reduce friction, limit valve stem wear, and support valve spring longevity