Crower 66491-2 Features:

Crower 66491-2 severe-duty raised-seat mechanical cutaway roller lifters for BBC and Big Dart Blocks, 2-piece pair. .842 in. OD body with .750 in. bearing and +.300 in. taller body to clear taller late-model lifter bores. Billet alloy body weighs 131 g per lifter and uses a premium stainless steel alignment blade for racing durability. Handles 750 to 900 lb of valve spring pressure with a 1.890 in. seat height to help correct pushrod geometry.

Severe Duty Rollers Raise BBC .842 Od Raised-seat Mechanical Features:

• BBC raised-seat mechanical cutaway roller lifters, .842 in. OD, 2-piece pair for late-model tall-bore blocks and Big Dart Block clearance
• +.300 in. taller-body design, 1.890 in. seat height, corrects valvetrain geometry in modern BBC racing block combinations
• Severe-duty billet alloy bodies, 131 g each, premium stainless steel alignment blades, lightweight strength for high-RPM stability
• .750 in. roller bearing, supports 750 to 900 lb valve spring pressure, built for demanding racing valvetrain loads and durability
• No oil restrictors required, raised pushrod seat design improves oiling and clearance for aggressive BBC mechanical roller cam setups