Mild 318 pinging

1973dust said
Just so I'm sure I understand. Are we saying that if I drop to a colder plug, I may be able to bump the initial timing back up without ping? I never gave any thought to plug heat range other than just purchasing plugs for a 340. That's what I get for assuming that what was listed for sale would be correct. Always something new to learn.

I think its borderline now. I'd put miles on on it and a full work out, then as a seperate step experiment with a timing change.
To get the most out of the widest range of rpm and conditions the current timing curve (shape) needs a little tweaking regardless of the plug.