The Ford Barn

coup34 · 08-14-2021, 05:44 PM

Are they a good plug for A's?

J Franklin · 08-14-2021, 06:24 PM

I thought those were 18MM plugs.

Jim Brierley · 08-14-2021, 06:24 PM

I don't know what the U stands for, but D-16 is an 18mm plug so won't fit the A head. D series were the plug of choice for early after-market heads. 16 is the heat range and would be satisfactory for the A engine.

Mike Peters · 08-14-2021, 07:44 PM

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UD 16 Champion next to a 3X Model A plug. I use the UD16 in a 1967 International 2424 loader tractor.

08-14-2021, 05:44 PM	#1
coup34 Senior Member Join Date: May 2010 Posts: 315	UD 16 Champion Spark Plug Are they a good plug for A's?

08-14-2021, 06:24 PM	#2
J Franklin Senior Member Join Date: May 2010 Location: Oregon Posts: 5,962	Re: UD 16 Champion Spark Plug I thought those were 18MM plugs.

08-14-2021, 06:24 PM	#3
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,087	Re: UD 16 Champion Spark Plug I don't know what the U stands for, but D-16 is an 18mm plug so won't fit the A head. D series were the plug of choice for early after-market heads. 16 is the heat range and would be satisfactory for the A engine.