Vacuum advance needed for cam break in?

More timing is better on break in than less.

I'd rather see 47 than the 34. Get it retarded enough and it will stick exhaust valves, over heat and other crap.

Guys think retarding the timing is safe. It's not. It's a parts killer.
Thanks for the insight. It’s not something that I’ve seen discussed a lot and wondered if it was more important to the cooling side of break in than anything else since fuel economy is a non issue.

Jake