spark plugs for point judjing

houseof34s said:
what is the correct champion spark plug# for a 1940 ford flathead V-8 engine?
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H10 with TWO rib. The so called "coke bottle" plug.
Five rib plugs did not come out until later and when installed in to a 1940 Ford should receive a point deduction of one point per incorrect plug.
 

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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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Kube is correct. These are very hard to find. I did manage to find a set at Hershey last year, but I had to look through several of the many vendors to come up with 8. Hershey would be my suggestion.
Good luck with your search..
 
In reference to what Terry said, it is generally accepted that the two rib coke bottle with the Ford Script is a Service Replacement plug. The correct one is marked Champion H10.
 
ford38v8 said:
In reference to what Terry said, it is generally accepted that the two rib coke bottle with the Ford Script is a Service Replacement plug. The correct one is marked Champion H10.
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It is "generally accepted" yet NO ONE has proof one way or the other if the FORD plugs were installed upon the assembly line or were later, service parts.
 
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