i bought the interchangable pulley kit from LFP when i had my stock block, i bought the 4# and 6#. now i have a built engine and would like to trade the 4# for an 8# if someone has one. the 4# has never been out of the box. i put the 6# on the day i bought the truck and planned on the 4# for winter time but i blew the stock block before i had the chance to swap them out. so if anyone has an interchangable pulley kit with an 8# and would like to swap it out for a 4# let me know. thanks.