ok, I got the lifters out the 472 hemi and this is what I found. It looks like the lifters galled and got stuck first then wiped the lobes then bent the valves. I don't understand, I never had low oil pressure problems. The lifter bores are not bushed or resricted from oil. These two lifters were directly across from each other on oposite sides of the engine. This was a Comp Cams 24-308-4 .557/.540 250 @ .050. What do you think?