Quote:
Originally Posted by tpepmeie
I had a stock lifter tested, and it showed 62, if I remember correctly. The key, as explained to me, is the depth of the hardening in the cams. I had a scrapped Jeal 470 billet cam that I sent off for testing. At the surface, it was compatible with the 62 of the lifters, however the hardness layer was exceptionally thin and the base metal was quite a bit softer. Any piece of metallic debris would break right through the surface layer and wipe out the lobe. At least that's how it was explained to me.
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Todd stock cams measure 55 to 56 rockwell and lifters measure anywhere
from 62 to 65 rockwell the difference being if you measuring on the outside
of the lifter or the inside of the lifter respectively.
If the cam was as hard as the lifter I think it would not last that long.That's why when you have billet cams made which measure around 62 rockwell the lifters need to be DLC'D (Diamond like coating) to make the
surface even harder.So the hardness of the cams and the lifter need to be
dissimiliar in order to work without failures,That's the idea is what was told to me.
AL.