Originally Posted by HinshawWRX
However it is a stress riser and can cause issues down the road. Plus the fact that he used a set of pliers to hold it down, run. And to answer the question, better be safe then sorry and just replace it.
Are you really worried about a stock cam in a stockish engine running stock valve springs fatigue failing from a stress concentration like that? The notch at the lobs should be a worse stress concentration than that, and so is the keyway for the cam gear.