[Keithc8]

This would depend on the type of crankshaft that you are running. I like the Federal Mogul or Clevite. Most of the bearings are now 1/2 to 3/4 groove in the performance line and they are heat treated. We use these on the heat treated crankshafts. We use the regular bearings on the cast cranks. We use a Ford Racing double roller indexable timing set in most cases. With big spring pressures we use a billet timing set or a Danny Bee belt drive. Good luck, Keith