Sounds like the old BD 264 engines in the IH trucks. They would cup the valve so much you could put a teaspoon of water in the top side of the valve head. Once this started after few thousand miles, readjust the valves and run good for a few days and then same thing. IH fought that problem for years. It basically was caused by over loading, lugging the engine. We even put a plate in the manifold blocking off the heat to the intake and that helped until it burned a hole in the plate. Got the guys to buy a 304 V8 and problem over. You will no doubt need new over size seat, new valve and guide. If stellite valve is available I would go with that.
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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