.035 requires a hotter spark to jump the bigger distance and a good mag delivers a much hotter spark than the 6 volt battery, if it is actually a good mag. Some mags will produce 36 volts. The .035 is also fine for distributors and a TrueFire system, among others.

Fouling plugs at either gap is not a plug issue. The X plugs are the right heat range so the issue is why is there so much oil. You could try a higher heat range plug but the real solution lies in keeping that much oil from getting to the plugs in the first place.

Jan 9, 2019 · A wider plug gap is best for firing a lean mixture. However, the wider the plug gap, all else being equal, the more voltage will be required to fire the plug. A Model T with a stock ignition system is better off sticking to factory recommended plug gaps.

Nov 9, 2012 · Model T "factory spec" is .03125", or to put it in the parleyance of back then, 1/32 o an inch. That's with Champion X's, or also with Splitdorfs, or any other original plug.

Jul 16, 2018 · My experience is with Model T's and Model A's, whose plug gaps are 0.025" and 0.035", respectively. The compression ratios are almost the same, so I have never understood the reason for almost 1/3 difference in spark plug gaps.

Find photos, videos, FREE downloadable Model T manuals and spec sheets, links to parts suppliers, vehicle importation services, plus heaps more. Another major innovation brought about by Ford was the chain-production line.

Aug 6, 2017 · What is the proper spark plug gap for Champion X or other old style plugs? Champion recommended .025″ gap for the X Plug, while Ford shop manuals recommend .032″. Anywhere in this range will work fine.