They have real short lash ramps, .014-.016
Also have much more aggressive stuff, just remember the shorter (tighter) the lash ramps, the sooner the lift velocity starts to accelerate. Can only go so far to the 'edge' of the lifter safely then bad things start to happen.
Boomed 5 blocks. 15-20% ran safely, for a while. Much more started bending cranks & rods, esp over 6500. shattered top rings if timing/fuel wasnt just rite. When the frz plugs are full of oil, its time for rings.
