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Also took a look at the valve lifters - measured the face surface with a dial indicator by sweeping the lifter on a flat surface. The originals are cupped in (concave) from the wear. They should have a crown. (convex)
I also bought new Melling lifters to test, they have a flat face
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Now to reface the lifters. Since no one refaces lifters anymore in the Netherlands, I'm going to think up something myself...
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The flat lifters should work as design. The camshaft lobes has a front to rear ramp on them to make the lifters spin.
Placing a crown on them would reduce the spinning effects.
On a side note, roller lifters camshafts does not have a ramp on the lobes. You do not want those lifters to rotate.