BBC Alm Roller Rocker Arm Set 1.7 Ratio

The LUNATI BBC Alm Roller Rocker Arm Set 1.7 Ratio is a full roller rocker arm assembly purpose-built for big block Chevy engines requiring precise valvetrain geometry and durable performance. This 16-piece set delivers the 1.70 mechanical advantage ratio necessary for optimized valve lift and flow characteristics in high-performance applications ranging from street engines to competition builds.

Each rocker arm features 7/16-inch stud mount configuration for direct compatibility with standard big block Chevy cylinder head specifications. The full roller design reduces friction across the valve stems during operation, a critical factor in maintaining consistent valve timing and minimizing parasitic losses in the valvetrain. Black anodized aluminum construction balances weight reduction with corrosion resistance, a consideration important in both street and racing environments where engine bay conditions vary. The 1.70 ratio specification determines mechanical advantage—higher ratios increase valve lift but demand stronger pushrods and springs; this ratio represents the proven sweet spot for most BBC applications seeking reliable street or strip performance.

Buyers assembling or rebuilding big block Chevy engines—whether for restoration, street performance, or dedicated racing—depend on rocker arm quality to ensure valvetrain stability and longevity. The complete 16-piece set eliminates partial-set compatibility concerns and simplifies ordering for full engine builds. LUNATI's Voodoo line positioning emphasizes valvetrain components engineered for demanding engine combinations where precision and repeatability matter.

Roller rocker technology across the industry has become the performance standard for serious BBC builds because it directly improves efficiency and reduces wear. This set's stud mount design integrates seamlessly into traditional big block Chevy architecture without requiring additional modifications or special mounting hardware.