Well I hope you do not have a failure. Another problem that could occur with those lifters is if the cam you are using uses 'all' of the lobe velocity of the 0.904" lifter. Some of the chamfers look horrendous. Because if the chamfer is, say, 0.030", then it is no longer a 904 lifter, it becomes a 0.844" lifter. The edge of the lifter will dig into the lobe very quickly. When I get lifters re-faced, I specify 'no chamfer'. Crower cams make 'no chamfer' lifters for high rate cams, eg #66971-16.
It is foolish to use lifters where the defects can be seen with the naked eye....& not knowing where the un-seen defects are. Better to get an old factory set re-faced.
