My oil pressure was between 15-20 on the return road and back in the pits(1250 rpm) but I do not think it is the lifters fault. My lifter bores are worn and loose and I think the pressure is going past the lifters. I also have spray bar rocker oiling which also contributes to loss of some pressure. I don't expect any increase in oil pressure with just the lifter swap. Just wanting a lifter the may be more durable and safer should it come apart. I had a failure a few years back and the needle bearings did a lot of damage.
Mike