Does anyone have a modern reference for the '36 Ply spark plugs? (cast iron head). I believe the gap is .025.
Thanks.
I don't know about a modern reference, but the original service manual calls for 0.025. That's how the plugged are gapped in my 39 and it seems to run fine. I included a copy of the page in case you wanted to see some of the other ignition specs.
I am running 0.025 on my P-6, as a starting point. Then I adjust it a little if needed to get the right tip color.
thanks; is there a recommended part number. for the plug, such as Champion, Autolite, etc.?
NAPA Auto Parts has Champion, Autolite and AC spark plugs for your car.
I use the Autolites myself, but others may like something different. Look it up on-line.
They show plugs for cast iron heads and aluminum heads, too. All the part numbers
are there.
AC Delco C45 is one.
Google is your friend. Rock Auto shows plugs from
a couple of manufacturers.
Here is a link to another supplier:
http://www.automobiliausa.com/sparkplugs.html
I had to look under the hood! I've got Champion RJ12C in the '39. Got them at AutoZone, but I get most of my parts at NAPA. Be aware that I am running a 12 volt system and the plugs only have about 2000 miles. So far, so good.
I've run Champion J-11 in my '33 since the 1970s. Champion plugs get a bad rap for use in our cars on some discussion boards but I've not had an issue. I tried AC Delco R45 but they did not seem to work as well. Could be because of the resistor in them (I could not find the non-resistor C45 in my local stores). Given my antique coil which is probably not quite up to snuff, any resistance in the ignition system is probably not a good thing for me.