[AT] JD 318 head bolts

[Dennis Johnson]

I have a JD 318, and was trying to remove the heads so I could grind or lap the valves.  In the process of removing the heads, 4 of the 5/16 inch head bolts snapped in the aluminum block. The problem is that there is some corrosion at the bottem end of the head bolts, so removing tries to take the rusted ends of the bolts though all of the threads. One bolt that was tight did come out, but it appeared that it may have galled threads in the block as it came out.
  Does anyone have any good ideas other than re-power or a block change.
   
  Thanks,
  Dennis