Crower 66491X903-16 Features:

Crower 66491X903-16 severe-duty mechanical roller lifters, complete 16-piece set .903 in. OD cutaway lifters for BBC Big Dart blocks with a .300 in. taller body Raised pushrod seat sits .300 in. higher than standard Chevy rollers for bore clearance Billet alloy body with a heavy-duty blade for high-performance mechanical roller valvetrains

Severe Duty Rollers Raise .903 In. Od Raised-seat BBC Features:

• Raised .300 in. pushrod seat for BBC Big Dart block lifter bore clearance, helping avoid lifter bore grinding during fitment
• .903 in. OD cutaway mechanical roller lifter design tailored for Big Block Chevy and Dart BBC block applications
• Lightweight billet alloy body with heavy-duty blade for severe-duty valvetrain control and added durability at high rpm
• Complete 16-piece set of mechanical roller lifters for demanding high-performance engine builds requiring matched components
• Raised-seat, .300 in. taller-body configuration promotes proper pushrod clearance in Dart BBC blocks and simplifies installation