spark plugs for point judjing
 

what is the correct champion spark plug# for a 1940 ford flathead V-8 engine?

Re: spark plugs for point judjing
 

H10, 5 rib with the black base.

Re: spark plugs for point judjing
 

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.

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.

Re: spark plugs for point judjing
 

The plugs do not have the Ford name on them.

Re: spark plugs for point judjing
 

Where can Champion H10 two rib black bottom plugs be purchased?

Re: spark plugs for point judjing
 

Just about no where. IF you find NOS, expect to pay $50 each. Good used? About $20+ each.

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..

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.

Re: spark plugs for point judjing
 

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.

Re: spark plugs for point judjing
 

Thanks for the all the great info V-8ers <> Much Appreciated For Sure.http://www.fordbarn.com/forum/images/icons/icon7.gif

Re: spark plugs for point judjing
 

what is the correct spark plug gap for the modern version of the champion H10 plugs/

Re: spark plugs for point judjing
 

Same as the authentic plugs :)

Re: spark plugs for point judjing
 

would that be 0.025/

Re: spark plugs for point judjing
 

0.030", I think.

Re: spark plugs for point judjing
 

Yes, .025".