Pulling the inner valve spring at cam break in?

NukeBass said

Random question: Why is it okay to run the engine to break in the cam with just the outer spring if you are supposed to have both springs to run it under normal operation? Does it have to do with just running it for a short time with no real load or limited RPM?

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That's right. Break in is a short time, also you would not normally run the engine at break in anywhere near the RPM limit the dual springs could stand, so there's no danger of engine damage resulting. Normally, I vary break in RPM between 2K and 4500. For dual springs, I like to bump the minimum RPM up to around 3K to assure good splash lube.