[adam83]

Our 351c 4V was running well with autolite 24 plugs. It has 4v heads, mild cam, headers and pro-form carb. Pertronix ignitor ignition and flamethrower coil.

Tye autolites were doing fine, but I've always used NGK plugs, and would like to see if they run as well or better.

The closest match I've seen comes up as NGK BP6FS. The guy at AutoZone couldn't find them by that number, he said he thinks they are ngk 5034. Is this true? If not, what is the model number for the bp6fs plugs?

 

[adam83]

Other sites say the part number for bp6fs is 3512

 

[matt167]

BP6FS crosses to a 24 according to the chart https://www.autolite.com/docs/defau...standing-spark-plugs/auto_crossref_0311_0.pdf

Problem is it appears they are hard to find. BP6EFS is easy to find but that crosses to a 104. Will work but it's not ideal.

I use NGK when I can, but in this case I'd run an Autolite and not worry