I have another basic question about my engine concerning oil priming. I used a drill to spin the oil pump and i noticed that oil is pumped into all the lifters on the drivers side but not the passenger side. ( I can see the oil well up into the top of the lifter). I have roller lifters so they can only be installed in the block so the side oil hole is facing either front or back. I put them all so the hole is facing to the rear since the oil looks to pump through the engine from the rear. My question is do i have a blockage somewhere preventing oil to the passenger side lifters?