It probably had an older hydra-lectric system on it.  But it currently has a newer system.  The story was that my great-grandfather went in the house for dinner and threw his coat over the steering wheel, and the coat held the levers and burnt the switches.  My guess is that they just replaced what they needed. Probably with the newer style. Thanks for the link.  There is a dealer close to me that has a few Super 77's with the valves on them but he isnt willing to get rid of them.  So I'll just keep on hunting.  

Being a Deere guy, Oliver tractors are a little foreign to me.  I pulled the old Oliver out of the barn and started tinkering.  The more i worked the more it needed.  I have a problem with it missing right now.  New plug wires, new plugs, new distibutor cap and rotor, new points, and new coil.  We have spark at the plug but still no fire.  It doesnt seem to be a exhaust valve stuck open or closed because it doent hammer because of no exhaust, and it does not flutter through the exhaust beause its open.  Any suggestions to where I could look for problems? 



Thanks