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Old 09-16-2014, 03:08 PM   #1
houseof34s
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Default spark plugs for point judjing
what is the correct champion spark plug# for a 1940 ford flathead V-8 engine?
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Old 09-16-2014, 03:19 PM   #2
Tudor40
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Default Re: spark plugs for point judjing
H10, 5 rib with the black base.
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Old 09-16-2014, 03:32 PM   #3
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Default Re: spark plugs for point judjing
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Originally Posted by houseof34s View Post
what is the correct champion spark plug# for a 1940 ford flathead V-8 engine?
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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Old 09-16-2014, 04:23 PM   #4
Don Rogers
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Default 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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Old 09-16-2014, 04:24 PM   #5
Terry,OH
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Default Re: spark plugs for point judjing
The plugs do not have the Ford name on them.
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Old 09-16-2014, 05:21 PM   #6
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Where can Champion H10 two rib black bottom plugs be purchased?
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Old 09-16-2014, 06:58 PM   #7
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Default Re: spark plugs for point judjing
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Originally Posted by houseof34s View Post
Where can Champion H10 two rib black bottom plugs be purchased?
Just about no where. IF you find NOS, expect to pay $50 each. Good used? About $20+ each.
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Old 09-16-2014, 08:30 PM   #8
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Default Re: spark plugs for point judjing
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..
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Old 09-16-2014, 08:36 PM   #9
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Default Re: spark plugs for point judjing
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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Old 09-17-2014, 07:49 AM   #10
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Default Re: spark plugs for point judjing
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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.
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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Old 09-17-2014, 08:36 AM   #11
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Thanks for the all the great info V-8ers <> Much Appreciated For Sure.
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Old 09-19-2014, 10:59 AM   #12
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Default Re: spark plugs for point judjing
what is the correct spark plug gap for the modern version of the champion H10 plugs/
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Old 09-19-2014, 11:15 AM   #13
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Default Re: spark plugs for point judjing
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what is the correct spark plug gap for the modern version of the champion H10 plugs/
Same as the authentic plugs
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Old 09-19-2014, 11:26 AM   #14
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Default Re: spark plugs for point judjing
would that be 0.025/
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Old 09-20-2014, 10:16 AM   #15
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Default Re: spark plugs for point judjing
0.030", I think.
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Old 09-20-2014, 11:21 AM   #16
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Default Re: spark plugs for point judjing
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would that be 0.025/
Yes, .025".
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