Quote:
Originally Posted by Ronnieroadster
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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Thank you Ronnieroadster, the exact information I was looking for!!!