PRW Power S/S Shaft Mount R/A System - SBM 1.5 Ratio 39000509 The MSD Module Selectors allow

The MSD Module Selectors allow you to choose two or three different rpm limits that can be activated at different times

Flat Washer

1/4 in Mounting Holes

268/280 Advertised Duration

PRW Power S/S Shaft Mount R/A System - SBM 1.5 Ratio 39000509 The MSD Module Selectors allowEngine Rocker Arm Kit 6061 Aluminum Needle And Cage Bearings 4135 Steel Alloy Shafts (Japanese)PRW Industries produces engine components for racing applications such as rocker arms, valve covers and main caps to name a few. These products offer performance gains at a value price. Product Description: Rocker Arm Shaft Mount 1. 50 Ratio Roller Tip Steel Natural Small Block Mopar