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If you measure the lobe at the base circle, you will most likely find some lobe taper. Meaning the lobe is bigger in diameter closer to the bearing journal. This concentrates the pressure on a smaller area leading to this type of failure. Not a big deal to regrind. And yes I have seen a lot of these. Almost all were the 9301051477R cores.
I wouldnt recommend it, but if anyone does try to reuse a cam like that be sure to keep the rocker arms on the same lobes.
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John Dougherty
Dougherty Racing Cams
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