ok so i bought a brand new h.o. 350. i primed the motor 45psi. then started it 35 psi at idle then 65 psi at 2000 rpm (break in 20 mins) everything looked good. called it a night. next morning started it up no oil pressure? check the line from block to gauge. no blockage. started again and gave it a little rev still no psi? i pulled the dist. messured pump shaft to top of block 7 1/4. dist. length is 7 1/2. i turned the oil pump shaft with prime tool and there is resistance like there should be. what else should i check ?? i have never had this before. and i have built many motors and never had a problem.