hi all,im trying to prime a fresh 460 ford,im using penrite running in oil 20w 50 grade.i cant seem to get oil to the rockers but the lifter gallerys are full and it shows 60 to 80 lbs at the gauge.its winter here at the moment and i think the oil viscosity is too thick when cold.any suggestions,everything else seems fine,it just dawned on me the oil could be too thick..thanks stu