christy12345 Posted November 22, 2020 Share Posted November 22, 2020 have an old 6COM-62 CHAMPION SPARK PLUG, And would love to know what it works/goes in? And an old C J 8 champion plug as well? Link to comment Share on other sites More sharing options...
Terry Bond Posted November 22, 2020 Share Posted November 22, 2020 Com = a commercial application. I'll look thru some catalogs later to see if I have any info but chances are your plugs fit a variety of different vehicles. Terry 1 Link to comment Share on other sites More sharing options...
Dave Henderson Posted November 24, 2020 Share Posted November 24, 2020 6COM-62, 18mm plugs were listed as for "Ford and pre 1926 Harley." by spark plug dealer Donald McKinsey in 1994 1 Link to comment Share on other sites More sharing options...
Terry Bond Posted November 24, 2020 Share Posted November 24, 2020 My pre-war Champion catalog shows this 18mm plug as mainly intended for commercial vehicles and motorcycles. It's a "severe service" plug and is recommended for engines that run hot. (It's a colder type plug.) There were no specific vehicle recommendations in the catalog but there is a note that it can be used in some Studebakers, but it is indicated as a plug that can be used to help correct rapid gap growth, pre-ignition, ping, overheating and core fracture caused by hot running motors, high speed usage, heavy loads and long highway upgrades in hot climates. Your J-8 Champion is listed as fitting the following: America Bantam (1938), Chevrolet(1937-40), Cadillac(1936-38 8 cyl and 1938-39 16 cyl), Chrysler (1931 Delux 8 and 1932-39 regular heads), Desoto (1932-39 regular heads), Dodge (1932-39 regular heads), LaSalle (1935-35), Overland (1939), Nash (1932-39), Oldsmobile (1937-39), Packard (1933-36), Plymouth(1932-39 regular heads), Pontiac(1833-39), and Terraplane (except Aluminum Hi. Heads). I note you've posed in a couple of places on the forum - here and Technical. It's always best to just post questions once to avoid duplicate and sometimes confusing answers. Hope this helps satisfy your curiosity. Terry 2 Link to comment Share on other sites More sharing options...
christy12345 Posted November 25, 2020 Author Share Posted November 25, 2020 Yes it did, and Thank you, Terry 😊 Link to comment Share on other sites More sharing options...
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