I'm getting what sounds like timing chain slap, but only when the engine is cold, seems to go away when it warms up. Only have about 15000 miles on the rebuild. I recently did the oil pan gasket and refilled with 10W-40 and all was fine for a few weeks, could the heavier weight oil be causing the tensioner not to work properly until the oil is warmed up? I did the timing chain cover gasket about 1000 miles ago and everything looked good, no wear on the guides. <img src="/forums/images/graemlins/confused.gif" alt="" />

84 Ext. Cab Pickup.