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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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