Reply to "Spark plug recommendation"

I can only tell you the temperature range of the plug that you need.
I am not familiar with the plugs that you are mentioning. They sound like they use a gasket on them like for the aluminum heads.

The temperature range that you need for any Ford High-Performance engine on the street is going to be the original Autolite AF32 for the original iron head 4v Cleveland or a BF32 for the 302-351w heads.

These are tappered seat plugs. The AF is a 14mm and the BF is the 18mm.

Around 1968 Ford sold the Autolite Division and created the Motorcraft Division.

The plugs became Motorcraft AF32 and BF32.

Recently Motorcraft stopped producing the BF32 as such and substituted the BF42 for it. This is a hotter plug and will generally cause some detonation in the cylinder over 5000 rpm. Do not use it.

This substitution by Motorcraft caused a domino effect justifying other companies to cross reference thier equal to the BF42 as the same as the BF32.

It is not so. This is a typical Techno-geek, pencil-neck, no practical knowledge anal retetive, screw you procedure.

You want the equivelent of the ORIGINAL 32 heat range. Crossing that over to another brand has now become a pretty large problem.

Do not use the Autolite 45. It is not the BF32 as it statee. It is the BF42.

Your best bet is to go to a Champion plug. They have the greatest variety and still have most of them available.