Crower 73639-1 Features:

Crower Enduro stainless steel stud-mount roller rocker arm for AMC 290-401 V8 engines, part number 73639-1. 1.7 rocker ratio with 3/8 in. stud fitment for precise valvetrain geometry on compatible AMC applications. Manufactured from 17-4PH stainless steel with a 1025 heat-treat process for fatigue resistance in high-stress RPM use. Lightweight body design provides clearance for valve springs up to 1.560 in. and uses oversized needle bearings at the fulcrum.

Rocker Arms AMC 290-401 1 1.7 Ratio 3/8 In. Features:

• 17-4PH stainless steel body, 1025 heat-treated for metal-fatigue resistance in high-stress valvetrain cycles
• 1.7 ratio stud-mount roller rocker for AMC 290-401 V8, fits 3/8 in. stud for precise valvetrain geometry
• Lightweight rigid design with clearance for valve springs up to 1.560 in., reducing flex versus aluminum rockers
• Oversized fulcrum needle bearings, alloy steel tip roller, and sure-lock rocker nuts for secure high-rpm operation
• Reduced friction to free horsepower, decrease valve guide and stem wear, and maintain accurate valve timing