Mark Gregory Posted April 6, 2015 Share Posted April 6, 2015 Could someone tell me the current spark number from the original number . Originally it was a Champion C -7 . It was installed in the 1931 Reo Royale 8 cylinder motor . What current spark plug would be the proper spark plug number to use for a replacement . Link to comment Share on other sites More sharing options...
misterc9 Posted April 7, 2015 Share Posted April 7, 2015 (edited) My 1995 Champion catalog says 1928-1935 Reo all models stock #516, plug # D16 .025 gap. Champion plug # C7 obsolete is replaced by plug #RD16. You can probably find one of these somewhere. It doesn't say so but i'll bet UD16 a booster gap plug would also work. Edited April 7, 2015 by misterc9 (see edit history) Link to comment Share on other sites More sharing options...
Owen_Dyneto Posted April 7, 2015 Share Posted April 7, 2015 If you go to the Autolite website and plug in 1931 REO it indicates that their current plug recommendation is #388. Link to comment Share on other sites More sharing options...
skyler Posted April 7, 2015 Share Posted April 7, 2015 d16 used in some farm equipment. readily available. they are champion and I think international blocks used them. skyler Link to comment Share on other sites More sharing options...
Guest Posted April 8, 2015 Share Posted April 8, 2015 There are some NOS sets of C-7's on ebay right now, but they want a lot of money for them. Link to comment Share on other sites More sharing options...
studeboy Posted April 8, 2015 Share Posted April 8, 2015 D-16 plugs were used on many make of tractors including case, massey, international. Their autolite equivalent are available stock at tractor supply stores TSC. Link to comment Share on other sites More sharing options...
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