Dumb question, but where is -2.5 degrees BTC on this damper? I've marked the "0" line but need to set to factory specs. I'm assuming BTC has to be to the left of that line
for BTC; ??

2.5 degrees ATDC would be at the bottom edge of that; the numbers are positive degrees BTDC.

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Matt Cramer
1966 Dodge Dart turbo / EFI project

Why are we running at ATDC? It should run better with at least a few degrees before.

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

I'm not used to looking at the driver's side mount timing tab, but 2.5 degrees BTDC would be half way up between the 0 TDC and the first line up (5 deg mark). Not?

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1982 Dodge D150 ( Ram)
225 with A833OD. 2bbl. Non power brakes

Thats what I thought as well; I need -2.5 degrees BTDC... NOT ATDC

I read your request as negative 2.5 degrees BTDC, hence positive 2.5 ATDC, sorry.

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Matt Cramer
1966 Dodge Dart turbo / EFI project

You do realize that the OE factory tune up specifications will not necessarily give you the best: emissions, drivability or performance today.
Todays gasoline is much different from what it was 40 or 50 or 60 years ago. Your engine, due to age and wear is also likely much different from when it was new. Most nearly stock old engines will run better with a bit more ignition advance than what is specified back when they were new.

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Doo Ron Ron and the Duke of Earl are friends of mine.....
https://www.youtube.com/watch?v=uX8Nj8ABEI8