Champion goes from cold to hot, D16Y, D18Y, D21, and D23. All 18MM with 1/2" reach.
Equivalent in AC-Delco: D21 = C88. D23 (hottest) = C88L
You can buy anti-oil-foul adapters that might help more then hotter plugs. But if you valve-guides are leaking badly, probably nothing will stop the fouling.
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Today's Featured Article - More Memories of a Field Service Engineer - by Brian Dye. Introduction: The author worked for one of the largest Ford tractor dealerships in England as a trouble-shooter on tractor engines, hydraulics and combine harvesters from 1963 to 1972. In 1972 he became a dealer manager and finally left the dealer net in 1975 to run his own electronic design and manufacturing company. [Editor] We live right in the middle of Norfolk. The dealership that I worked for sold Fordson Tractors from the 1920's and some of t
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