Re: Spark plug preference...Curious
Quote:
Originally Posted by rockfla
For the 3rd time, STOCK. 6V system, positive ground. Original 39 Mercury engine....NO aluminum heads, NO high performance JUST STOCK. AND numbers sure help a fellow, I've got 3 different NKG numbers, 3212's seem to be the one (Thanks Bored&Stroked).....but NKG's web page only has to 1950 SO not sure if an 8BA plug is good for 39 Merc???? The "plug" cross reference page I looked at listed "several" NKG numbers 3212 being one and 3112 being one, not seeing where 7131 is listed for a flathead BUT That is what NAPA's web page shows for a 39 Mercury????
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The best choice of plug for your Flathead as others have mentioned is the NGK B4L or B6L the NGK plug works perfectly for stock as well as modified applications being 6 or 12 volt neg or positive ground has no effect over the spark plugs performance. The Autolite 216 is a second choice but is in no way as good as the NGK . Champion plugs being made in mexico are prone to failure so what ever you do stay away from that brand. Ask your NAPA salesman for the B6L plug no need to try and figure out the part number.
Ronnieroadster.
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I use the F word a lot no not that word these words Flathead , Focus and Finish.
"Life Member of the Bonneville 200 MPH Club using a Ford Flathead block"
Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline.
First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH
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