Those are the numbers I get on my 455 and have had since I rebuilt it a few years ago. When I was rebuilding it, I noticed the lifter clearance in each bore was 0.002" which seemed high to me (you could feel the lifter rocking in the bore) but it was within Pontiac's spec (just). I wonder if the oil leakage past 16 sloppy lifters explains the pressure being somewhat low? Anyway, I don't worry about it.
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