Comp cam springs and break-in

Just an addendum: The way it has been explained to me is that a damper spring in operation actually doesn’t provide any significant spring pressure. It is set up to provide tension and compression force against the spring (sometimes even sandwiched between an inner and outer spring) it is paired with. Most of the tension in it is used up when it’s doing it’s function of dampening harmonic waves in the valve spring(s). So yes, always leave dampers in, but especially even more so during break in. Not a good time if harmonics make the lifters and cam lose contact during break in.