Thanks for replying. I primed the engine, and my oil pressure was about 25 lbs. I took the engine apart again, and put it back together with the same result. The reason I wander about the lifters is because I noticed when I put it together for the second time, that the lifter bore is longer on my engine and the lifter didn't completely cover the oil hole on the lifter bore as it did on the earlier 318 I had.