You can usually do the valves on an older motor without problems.
I've found it rare but if you seal the valves up on a marginal motor they will use oil.
I used to run a shop and one guy walked with his Ford inline 6 head and wanted the valves done. It still didn't run when he put it back on because he had put diesel fuel in it. It started using oil bad and he pulled for nothing. It seems like I seen another case but I can't remember.
On a Ford car with a 3.8 #6 was fouling also. The hook in the spark plug ground lug would hold the oil till it cooked. I think a new plug would go 2 weeks and a cleaned plug about a week. I tried cutting the lower part of the plug ground lug off and bending the side part in until it was about the same gap as before. This let the oil drip out. It ran about a month without fouling before they quit driving the car so I don't know the long term outcome for that.
In any case I do believe the fresh valves triggered this.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil�s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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