then I seen a lot of pictures and videos with people putting them in backwards.....

to clarify, these are morel retrofit hyd rollers (top of lifters are NOT flat) going into a production iron 360 LA block (no R or aftermarket block).....regardless, the question still is, is .015 enough clearance..i know things will go kaboom if it ends up interfering in a dynamic condition - hence the question....sounds like the consensus is it might be ok, I think I will check clearance without pushrods (no valvespring pressure) and compare with clearance with valvespring pressure, if there isn't any measurable deflection in a static condition, I guess I will go with it, unless somebody has firsthand knowledge that I need X amount of clearance.....thanks for the insight so far!