ok me question is this i had a knockin in the bottom end from a stuffed harmanic balancer so i swaped it for a good one and dumped the oil an put cheap oil an some engine flush though it an started it for 5 mins then dumped the oil an put new oil an filter in it now i got a knockin in the top end is that just the H/lifters that stuffed out when i put the engine flush though it or what any ideas??????