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My small block was running great. So I decided to do a cam change and tear it apart. I wanted to check the timing marks from the previous owners build. So I did the following.
1. Marked #1 plug on dist. base and removed cap.
2. Rotated crank until rotor pointed at #1 (confirmed compression) then put the mark on the balancer at zero on the timing tab.
3. Removed the timing chain cover.
Now at this point I was expecting to find the crank dot at 12 o'clock and the cam dot at 6 o'clock. That did not happen.
The crank was at 12 o'clock AND them cam sprocket was also at 12 o'clock.
When I line them up at 12 and 6 the rotor points at #6.