Just wondering if anybody else planes there own heads. i have a big piece of marble and glued emery cloth to it to see if i could make this work. I was having head gasket problems I also counter sunk my threads in the head seems to work good. The heads where very uneven maybe 00.15 to clear them up. For counter sinking the threads i found a drill bit that just cut the threads also i.m checking head bolt length i was told they can stretch. P.S these are shovelheads.