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09-16-2014, 04:23 PM
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#7 |
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Senior Member
Join Date: May 2010
Location: Wildwood, MO. (near St. Louis)
Posts: 1,850
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Re: spark plugs for point judjing
From looking at Champion ads and Plug Charts, it appears that 2 rib H-10's were manufactured thru early World War II (1941-42). Some time during the war the design changed to 5 ribs and was used thereafter. See enclosed image.
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