I was looking over old posts today and noticed your reply. First off, low ash oil is good, I like it but not the only reason for valve burning. In 1969 I went to Hickory Hills training school near Chicago for a week. One subject was gasoline engine reliability. At that time IH had not yet introduced low ash oil. That came a few years later. They also introduced a improvement package which included new sleeves & pistons, valves , valve seals and a new distributor along with improved gaskets. All of these along with low ash oil helped a lot. The 656 was not equipped with stellite valves but I did put them in a lot of them when doing valve jobs. Another things, once your torch a valve, you will often find the valve seat is no longer tight in the head and then you need to install oversize seats. The valve head gets rid of most of it's heat to the valve seat so if it is loose the valve runs too hot. Now as far as the 666, one thing they did was to increase the cubic inches of engine but stay with a smaller venture in the carburetor thus limiting the horse power some what. This reduces the available air to engine so therefore it also reduces the heat and pressure in the cyl. That engine lived much better due to these changes. You could easily get another 10 horsepower out of that C-291 in the 666 but running with extra cubic inches and lower horsepower it just plain made for better engine life. Note, my spell check keeps screwing up my spelling on the carb venture.
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