fattest cam in a 340?

Hyperballsmcgee said

you can NOT see any sort of marking on the harmonic balancer. there is a notch in it, but you can't see it with the light.

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Use a colored pencil or permanent marker and highlight the line with it. I find silver metal marking pencils work great. If the cam is large, you'll need timing tape or a dial back timing light and I second the use of a vacuum gauge as well.

I also agree with degreeing the cam as a mandatory step.