Your machinist is correct. I always do a 1 hour break-in run on flat tappet cams. I vary the RPM to diffrent speeds every 5 minutes between 2500 and 1800. And I put fans in front of the radiator to keep plenty of fresh air flowing. I've never wiped a cam lobe in 45 years. But, just to be safe in my older age, I've switched to using all roller cams.
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