Correct plug heat range for 360

smokinnjokin said
I don’t see how they are a waste as they cost 1.50 a plug on rockauto, A couple cents more than autolite copper. I agree with you about all the fancy stuff, I just picked them because they were cheap and seemed like a decent set of plugs.
I don’t want to get into up spark plug brand debate, there’s pages of that in the forum already. I was just curious if anyone had some actual experience with spark plugs in a warmed over smog 360 running pump gas.

I have no idea what the original application for this motor is, I was kind of thinking along the same lines with the GR4. Or an autolite 65, 66.

It's a waste of money because that plug wasn't designed to do what you are asking it to do. Use a copper core plug and be done with it.

I stopped using N series Champion plugs back in the early 90's. Use the C series. Instead of the 13/16 hex the N series uses, the C series uses a 5/8 hex. It's much nicer to use a 5/8 plug socket than that big, clumsy 13/16 socket, especially if you have headers.