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.
139 tooth ring gear.
10 pitch tooth profile.
Weighs 5.2 pounds.
Converter pattern 1 - 3 holes 7/16" diameter on 10.75" bolt circle.