www.theoldone.com this page shows how energy dynamics, goes about reworking a head. It even shows some ways to rework the block. If I were you i would try to pick up some trash small block shevy heads and play around with the die grinder and practice some of the techniques and methods on that before you go grinding on a perfectly good head...It may not be rocket science, but i takes time patience and finess, one wrong move and ouch you need a new head..just my .02