What cam to use in a 318

Bewy said

Re-grinding a stock cam to get more lift will leave the lobe physically much smaller..... You may need longer prods. Not the best solution.

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Can you explain why it's a bad idea? Other than your opinion? As long as the valve train geometry is correct with the correct length pushrod, it hurts nothing. So from an actual engineering standpoint, please tell us why it's not a good idea.