Crower 73645-1 Features:

Crower Enduro stainless-steel stud-mount roller rocker arm for AMC 290-401, part number 73645-1. 1.6 rocker ratio with 3/8 in. stud size, full-roller design, and polylock nut style. Built from 17-4PH stainless steel with 1025 heat treating for valvetrain strength and precision. Features oversized needle bearings, alloy steel tip rollers, and clearance for large-diameter springs.

Rocker Arms AMC 290-401 1 1.6 Ratio 3/8 In. Features:

• 17-4PH stainless steel construction with 1025 heat treating for high-strength valvetrain stability and long-term wear resistance in AMC 290-401 builds
• 1.6 full-roller rocker design with alloy steel tip rollers for reduced friction, precise valve motion, and improved high-rpm durability
• 3/8 in. stud-mount fitment with polylock nut style and sure-lock rocker nuts for secure adjustment retention under performance use
• Lightweight one-piece body with premium oversized needle bearings and added clearance for large-diameter valve springs up to 1.560 in.
• Engineered for AMC 290-401 applications; installation requires machine work for proper fitment in performance valvetrain setups