Hi
I have 76 F350 has a 400 engine with oily spark plugs on the left bank only.
The right bank is ok.
All 4 plugs on the left bank are oily.
If it was one plug i could understand, but all 4 on only one bank i dont understand.
Its not the carbs fault i just rebuilt it.
Only thing that comes to mind is the oil return passages are blocked causing the oil to build up around the intake valve stems.
The stem seals are old and not controlling the oil along with stem and guide wear.
Good luck.
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oily plugs on one bank
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