Quote:
Originally Posted by Schurkey
It's not the cam that matters, it's the valve springs.
You are likely to have real problems if there's more than 130 lbs of seat pressure. Remove the inner springs if needed to get below 130 lbs. Of course, you'll want appropriate oil as well. I assure that the lifters rotate in the bores by marking the lifter and the lifter bore with a Sharpie, then turning the cam. Spin the crank a few turns--or perhaps just the cam if the timing chain isn't installed yet--and you'll be able to tell if the lifters spin. They may not all spin the same amount, but they better all rotate some amount.
Lunati suggested to me to break my BBC cam in with a couple of thousandths of lash, so there's no valve spring pressure scraping the oil film off of the base circle. I guess that cools/lubricates the lifter foot.
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I bought the cam and matching springs as a set from Ace Brewer. I guess to be safe, I need to ask him and the builder how I need to treat the springs on break in. The builder is a member here who has a good record building Pontiac engines.
I never learned how to measure seat pressure.