Quote:
Originally Posted by tubman
This brings to mind the issues of new lifters on a used cam. This is generally considered to be OK as long as the cam is in good shape. In the final analysis, you can try anything, but using mixed parts can sometimes end up in not a good way.
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It also has to do with spring pressure. If you're running a stock cam, you only need about 45 -50 lbs (max) of spring pressure . . . so that tends to be a bit more forgiving when using older lifters. BUT, you want to check the bottoms of the lifters - they should have a very slight convex "crown" on them. If not, then you might want to get them resurfaced.