i recently rebuilt the motor in my teg. pressure at start up is good then with a warm engine at 3000rpm oil pressure is about 45 and "should be beteen 69 and 79". when i change the oil the filter is almost dry. i put brand new bearings, and high comp pistons in the motor and a new oil pump. any help would be much aprecieated.

 

Re-check the clearances on those bearings, looks like it could be off.