Leslie Goudy
Join Date: Dec 2010
Location: Massachusetts
Posts: 166
Car: 1984 Pontiac Firebird S/E
Engine: Pontiac 2.8 L V6
Transmission: Automatic 4spd
Axle/Gears: Stock
This guys avatar looks like your car kinda
not the pic below, that was the answerer
Re: How to set timing on a 2.8
Pretty much what he said, set base timing to 10* below top dead center with EST unplugged, then plug back in the EST and you're done. As for DR, I would also guess that it stands for degrees, but regardless of what the DR stands for, that is the timing spec/procedure.
(That source is old but they all say 10 degrees) one guy left a photo