Had the same problem , 605" megablock with 572-13 heads , i ended up plugging the oil way on gallery side of lifter & using the lifter bore as the restriction , i now have 25/30lb @ idle , 60/70lb down track.

I purchased the motor with a spun rod bearing , maybe this was the cause.

Last edited by 602heavy; 09/02/09 06:46 PM.