Crower 66219X903-16 Features:

Crower severe-duty mechanical roller lifters for Ford 370, 429, 460, and 429 Boss Z-BAR applications; 0.903 in. OD design. CNC-machined 1-piece alloy body with orbit-formed locking mechanism for high-rpm valvetrain stability in full-race use. 0.812 in. bearing OD and 1.590 in. seat height; larger, thicker-wall bearing design helps support extreme spring loads. Rated for 1,000 to 1,300 lb spring pressure; requires 0.0015 to 0.0025 in. tappet bore clearance for proper fit.

Severe Duty Roller Lifter Ford 370-429-460 Z-bar .903 In. Features:

• 0.903 in. OD mechanical roller lifters for Ford 370/429/460 and 429 Boss Z-bar full-race valvetrain applications
• 0.812 in. bearing OD with 1.590 in. seat height for precise lifter positioning, fitment, and stable valvetrain geometry
• CNC-machined 1-piece alloy body with orbit-formed locking mechanism for severe-duty strength and high-rpm control
• Handles 1,000 to 1,300 lb spring pressure with larger thick-wall bearings for extreme race loads and durability
• Requires 0.0015 to 0.0025 in. tappet bore clearance; oil restrictors not recommended for proper bearing lubrication