On the triple spring round track cams we ran, we would do the break-in run with only one spring installed. Some of those engines had a seat pressure of over 300 pounds- - - - -much more at full opening of the valves. I can't imagine a good reason for running a used cam and lifters, when the whole purpose of a break in is to establish a running fit between the cam and lifters.
Jerry
I believe the purpose was to make sure the new build ran properly at the right RPM for the right amount of time before attempting to break in the new cam. Like I said I'm not a flat tappet guy. I think they are one of the stupidest things I have seen in over 50 years. But I feel the same way about distributors so there's that. Maybe the freevalve thing will catch on and I can throw the cam and valve train away without having to buy a $400,000 Koenigsegg engine.
