I was wondering what John Deere model uses similar valves as the 80. My guides are bad on one head, I just bought 2 rc's a 38 and a 39 and a 40 std  that all need work; valves/1 set sleeves/pistons/etc. Makes 6 80's for me and I am hope to have them all fixed up, 2 are done one just needs paint. Any help would be greatly appreciated-Adam