Mine went 300 passes with a valve spring and lifter change only. The Comp lifters were replaced with Isky bushed Red Zones after I noticed extra lash in one. I will replace the Comp springs (broke 6@150 passes) with Paks and we'll see how far it can go now. It has aluminum rods otherwise it wouldn't be coming out for maintenance now either. Bearings have always looked prefect when checked at 100 pass intervals. Mph hasn't dropped since fresh. I've had no need to turn past 7000 rpm. Doug
