Re: 1954 359 L8 / Iridium spark plug in place of Autolite copper resistor 308 spark plug

Posted by Packard Don On 2022/3/28 12:24:03

The plugs in my 1954 Patrician are the multi-tip type that require no gapping at all and have been in it for over 40 years. Still look new but unfortunately they were from JC Whitney and I know of no modern equivalent. Not saying there isn’t one but I have no numbers.

When I first put those in and also put in graphite oil, the idle speed started getting faster and faster to the point that there was no need to push the accelerator to go 35mph and, once readjusted, mileage greatly improved. Sadly, it has regular oil in it now as the graphite was discontinued. People apparently didn’t like it because it was black to begin with so difficult to know if it was dirty. I still have an unopened can or two, though!