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Disclaimer: I am not a mechanic and I could not find this answer anywhere on the internet. But I did just replace my distributor on a 2002 Astro with a Vortec 4.3 liter. When I looked from the bottom of the engine I saw a pointer on the block (arrow). I used this to find TDC on number 1 cylinder. Afterwards, I noticed from the top that there is a "V" notch for alignment. My best guess is that if you use the arrow, use the first mark (my engine rotated clockwise). And if you use the notch, use the second mark. It probably depends on the vehicle the engine is in. As for the distributor, there is a square notch on the part that rotates (with the rotor removed) that must line up with the arrow on the distributor housing somewhere around the two o'clock position. Getting the oil pump slot to align with the tang at the bottom of the distributor can be tricky.

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Q: Why are there two timing marks on the 4.3 liter vortec?
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