I recently rescued a 320 from the scrap heap. The tractor is i amazing shape with only 670 hours on the meter. It has the Kawasaki 17 HP Motor. A valve broke and trashed one head and piston. Local JD Dealership wants $2700 for a new long block and the parts to fix are about $700. My question is this, does anyone know where I can get a used head or has a used head to sell. I am going to punch both cylinders out 20 thousands, replace both pistons and replace the plastic cam shaft with a steel one but doing a total top down rebuild will cost me about $900. If I can get a used head it would sure cut the costs a bit. Also if anyone has any other recommendations while I am rebuilding this motor that would be awesome. Thank you so much.