Crower 66491X903-2 Features:

Crower 66491X903-2 severe-duty raised-seat mechanical roller lifters for BBC Big Dart Blocks; sold as a pair. .903 in. outside diameter with a .300 in. taller body to help clear the lifter bore in Dart BBC applications. Pushrod seats are .300 in. higher than standard Chevy rollers to improve pushrod geometry and clearance. Cutaway roller lifter design helps eliminate lifter-bore grinding for pushrod clearance in compatible Dart BBC blocks.

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

• Raised-seat mechanical roller lifter pair for BBC Big Dart Blocks, .903 in. OD, cutaway severe-duty design
• .300 in. taller body and .300 in. higher pushrod seat for added lifter-bore and pushrod clearance in Dart BBC blocks
• Eliminates lifter-bore grinding in Dart BBC applications, improving pushrod geometry and installation fitment
• Severe-duty mechanical roller construction for high-performance valvetrain stability in demanding BBC race-engine setups
• Pair configuration for custom engine builds, with raised-seat geometry tailored for BBC Big Dart Block compatibility