[C2] spark plug question
1967 Pedal Car Champion
Joined: Mar 2020
Posts: 9,262
Likes: 4,326
From: US-PNW
Download the free PDF GM Heritage information kit from the link in my signature. That will tell you the original plug specs and from there you can convert to modern plug type.
That said, non-resistor plugs from that era are not commonly available any longer, so all will be resistor-type. It's also advised to go one heat range hotter than factory for better performance with today's gasoline formulations.
I like NGK brand after decades of AC Delco. They seem more reliable and the screw on tips don't come loose like they did on my last set of Delcos.
That said, non-resistor plugs from that era are not commonly available any longer, so all will be resistor-type. It's also advised to go one heat range hotter than factory for better performance with today's gasoline formulations.
I like NGK brand after decades of AC Delco. They seem more reliable and the screw on tips don't come loose like they did on my last set of Delcos.
Le Mans Master
Joined: Nov 2015
Posts: 7,510
Likes: 2,662
From: Really Central IL Illinois
Owen has given you some good advice. I use the R45S plug (or equivalent) as it has an extended electrode and doesn't carbon up as quickly when cruising the car around town.
