Features of this part number include:
Concentric machined to .005".
One piece design - 100% machined.
Proprietary heat treating process.
Chamfered gear tooth provides better engagement.
Application information:
Fits big and small block Chevrolet.
153 tooth ring gear.
12 pitch tooth profile.
Weighs 5.8 pounds.
Converter pattern - 6 holes 7/16" diameter on 10.75" bolt circle.