Hi Guys, Just wondering what spark plugs everyone is using. I am using Ac Delco's R43's in my 350. It's from a 69 Vintage Chev. small chambers. Can't remember the casting numbers though, 1.94 valves.
ACs for me as well. I've got them in all heat ranges from 42 to 46. Been stockpiling them for years picking them up individually or in sets from swap meets. Carl is right, GM engines like ACs better than any other plug.
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Hillar
1970 LS4 (eventually an LS5) Laurentian 2dr hdtp -and a bunch of other muscle cars...
One more beef about Champion is how easy they break. Yes, I know, I'm a lousy mechanic if I break them putting them in, but they are very brittle compared to AC.
Besides, I'm a parts manager, not a technician!
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)