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You may have remains of Rodentis Wisonsonis in you cooling fins, or you may have the wrong distributor, or the correct distributor timed wrong for you engine. If the timing is extremely late for the cylinder in question, that may have caused the burned valve, and the overheating problem in that cylinder. Wisconsin used a couple of different crankshafts in the V-4 engines. Some were set up to fire at even intervals, and some were not, so there are two types of cams in the distributors. On the even-fire engines, the 4 cam lobes are equally spaced. On the odd-fire engine distributors, the cam lobes are unevenly spaced so the ignition sparks occur at the proper time for each cylinder. If you have an odd-fire engine set up with an even fire distributor, or an even-fire engine set up with and odd-fire distributor, you're gonna have problems! I don't know a quick way to determine which crankshaft your engine has. Of course, the camshafts are different, also, for the two designs. Maybe someone will post with more info. on this. If you have an odd-fire engine, there is one correct way for the distributor to be timed to the engine in order for the timing to be correct for all 4 cylinders. I am away from the shop for the afternoon, so I can't get the timing procedure for you now, but if no one else posts, email me, and I'll find my Wisconsin VF-4 book when I get back to the shop. The distributor rotor for the odd-fire distributor has a long, curved outer brass end, so the spark from the odd-fire cam will reach the spark plug terminals on the distributor cap with even-spaced terminals. Several days ago, someone was dealing with an odd-fire version posted on this site. Here's the link... Link
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