What I disagree with is it’s not 1985 anymore. A properly honed bore with modern rings will be ready for synthetic oil as soon as the cam is broke in. I’m all for leaving the brake in oil in longer than that. I leave it in for 700 miles or so and go straight to synthetic oil.
I tried to get the builder's view on that for my jeep's 360 and got a pretty vague answer. Figured it was best to assume the rings might need conventional. Stock cam, 0.30 over, just a rebuild.
