[FC] Spark Plug Questions -Again

[robert wilson]

Hi Guys;

I know in the past I've seen an AC 46F plug recommended for low-horsepower engines in FC's to help alleviate fouling.

Corvair Basics  lists a Bosch W10AC, NGK B5H5 and Autolite 416 as alternatives to the 46F.

I have been running Autolite 425's, which have been fouling.

At my local Autozone store, the counter rep gave me a Bosch SuperPlatinum 4216 (new numbering system?) which he said crosses with the Autolite 416.

The threads on the Bosch 4216 are 3/4" while the Autolite 425's that are in my truck are 1/2".

Will the longer Bosch plugs work?  If not, what can I use off-the-shelf?

Thanks,

Scott Wilson