Happy Friday. Should be a good weekend to work on our old trucks, though still a little warm.
Regarding my
'51 1/2-ton 216 straight-6, below I have links to web pages that show 3 spark plugs, with specs, from Autolite, and I ask which you believe is most appropriate.
This is Autolite model 86 (scroll up after landing on the web page), the plug I've been using the last few years (about 4 miles on 'em, but a whole lotta fouling), from NAPA.
This is Autolite model 85, the plug NAPA sold me yesterday (I'm changing out my plugs).
These two are very similar and I don't think I care about the difference between the two.
This is Autolite model 303, which is what I find when I use Autolite's product finder for my make, model, and year.
The differences are that 85/86 have a "tip configuration" of "Mid Projection", whereas 303 has a "Short Projection", and 85/86 have a "terminal type" of "Solid", whereas 303 is "Removable". Also, 303 is what the website recommends for my truck. 85/86 are recommended for V8s from 1955-57.
Any thoughts on whether it really matters?
Finally, regarding the mystery (for many of us), of which way the plug gasket should be oriented,
check out this web page. Many of you will be surprised, as I was.
