[Healeys] knock

[healeymanjim]

have a little over 1000 miles on my car since the engine was redone this winter.  have discovered a knock in the front of the 
engine which disappears as soon as oil pressure comes up.  suspecting bad bearing dropped pan and pastigaged the 
bearings.  less than .001 with no visible wear.  crank was reground and new bearings.  also replaced the timing chain 
tensioner and damper.  will not knock when starting cold.  any ideas?