Timing Marks - 1992 4.3

1992 Astro, 4.3 with a Z in the VIN #

While playing with the transmission (tonite's lesson was the value of having a transmission jack) - I looked up at the front of the engine and was surprised to see what appears to be two grooves cut in the whatchamacallit (harmonic balancer?) for timing marks. Are they indeed both timing marks? If so, which one are you supposed to use when you time it?

Thanks

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Gary N. Mace
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Gary N. Mace

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