Crower 66031J-12 Features:

Set of 12 hydraulic flat-tappet lifters for AMC 199, 232, 242 4.0L, and 258 4.2L 6-cylinder engines Manufactured by Hylift/Johnson for Crower; direct-fit for 1964-1998 AMC 6-cylinder applications 0.903 in. body diameter, 1.600 in. seat height, and 108.3 g weight per lifter Designed to pair with hydraulic flat-tappet camshafts and rated for engine speeds up to 6,000 RPM

Hydraulic Lifters Johnson AMC 199 232 258 4.0L 6-CYL Features:

• Set of 12 hydraulic flat-tappet lifters for AMC 199, 232, 242 4.0L, and 258 4.2L 6-cylinder engines applications
• 0.903 in. body diameter with 1.600 in. seat height for correct fit and optimized valvetrain geometry alignment
• Rated for up to 6,000 RPM operation with hydraulic flat-tappet camshaft compatibility for reliable street performance
• 108.3 g per lifter construction for consistent valvetrain motion, stable operation, and dependable hydraulic response
• Direct-fit for 1964-1998 AMC 6-cylinder applications; ideal when replacing lifters during new camshaft installation