here is some education for those considering any of these reinforcement options... the cap in the pic below is made from 7075 aluminum and is a cross bolted main cap for a hemi. as you can see the crack that formed is all the same location where most of the big block cap failures occur. the crack starts are a radial line shooting outward from the crank bearing journal and ending at the high stressed area where the main stud nut would be located. cast caps fail this way as do stock replacement style caps when the power levels go up. (i can't pin point an HP level because not everyone puts their cars on a dyno or runs at the track.) this cap below also shows tons of evidence of cap walk on the block mating surface.