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Bob-A · 05-17-2018, 05:16 PM

I've got a handy little cardboard Feb. 1936 Champion Spark Plug Service Type Selector graph/chart. It shows '30, '31 Ford uses 3X with the C4 as the next hotter plug (1st step) & the 3 Com. (2nd step). The O com. is the
only next colder plug.

I run the W18 Champions, Thank you Mr. Purdy.
Last time I looked my plugs were a light dusty brown color and the car is
running great. I do have the habit of forgetting to readjust my carb. GAV.
Back down once warmed up and driving.

Bob-A

PS: I'm also running a Pertronix Flamethrower coil.

05-17-2018, 05:16 PM	#16
Bob-A Senior Member Join Date: May 2010 Location: Central FL, USA Posts: 1,140	Re: Would you recommend a hotter plug? I've got a handy little cardboard Feb. 1936 Champion Spark Plug Service Type Selector graph/chart. It shows '30, '31 Ford uses 3X with the C4 as the next hotter plug (1st step) & the 3 Com. (2nd step). The O com. is the only next colder plug. I run the W18 Champions, Thank you Mr. Purdy. Last time I looked my plugs were a light dusty brown color and the car is running great. I do have the habit of forgetting to readjust my carb. GAV. Back down once warmed up and driving. Bob-A PS: I'm also running a Pertronix Flamethrower coil.