i pulled my motor to freshen up cam and lifters good had a knock when i reved let off and tapped the gas. it only happenned when i tapped it not when the revving occured. i checked the thrust bearing "hold on to your seats" its .250 thou is the crank shot what can i do??????????? also it had a d-6 1300 rpm stall convertor in it when i bought it noticed the noise then recently put in a 2800 i dont no if the original convertor ballooned the previous owner