RCD   SBC CRANK SUPPORT EXTENDED -  for use with 1V Accessory Pulley  *    Cannot use 2V    with NO accessory puley use  202200-0002-ASSY

                                         Minimum size lower pulley is a 55 tooth 8mm   4.76"  ID

Comes with Long RCD Chevy SB Hub and RCD Small Block Crank Bolt

Will accommodate 1V  pulley only,   not 2V *

Works with all 6-3/8"  RCD Trigger Wheels and Degree Rings 

Bearing rated to over 9000  RPM

Belt Drive bracket  300700-0001   

55T 8MM pulley is the smallest you can use and ideally the largest you want to use provided it does not hit the pump extension