What are the values for this timing tab?

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Old February 7th, 2016, 12:28 PM
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What are the values for this timing tab?

Hey all, one more post for the day.. was gonna check timing on the 425 motor in my '67 Delta, and pulled this tab off of it to clean it. After scrubbing, I found that there aren't any numbers to indicate how many degrees it's set at.

My question: do you guys know what each of these notches indicate? I assume it should be timed to the square > circle point. Someone swapped in a 4bbl setup for the original 2bbl setup. I'll find corresponding timings on that one thread that's out there.

Thanks again for the help!





Timing tab I pulled off this '67 425
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Old February 7th, 2016, 01:44 PM
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I believe if you rotate it in your hand by 180 degrees, you will notice that the square circle becomes a '10', so the marks are 5 deg and 10 deg advanced.
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Old February 7th, 2016, 02:48 PM
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Actually the circle is 0, the center slot is 5, and next one is 10.
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Old February 7th, 2016, 03:11 PM
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Originally Posted by RandyS
I believe if you rotate it in your hand by 180 degrees, you will notice that the square circle becomes a '10', so the marks are 5 deg and 10 deg advanced.
Oh.. Duh. I wondered if that's what it was. Someone took it off and installed it upside down, I suppose. Thanks guys.. And it's definitely advanced, not BTDC, correct?
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Old February 7th, 2016, 03:14 PM
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Advanced is BTDC
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Old February 7th, 2016, 03:18 PM
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Originally Posted by oldcutlass
Advanced is BTDC

Whoops.. Thanks!
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