This balance plate is made from quality H60 steel for use with 350 flexplate for external balanced 383 or 400 engines. Recommended for RM-901 and RM 920 flexplates. Features: Zinc Plated Made from quality H60 steel Stamped “Engine side” For use with 350 flexplate on external balanced 383 or 400 engines Recommended for RM-901 and RM-920 flexplates