You dont.
It is 8-10 degree before top dead center with engine warmed to operating temp., RPM's at the proper range and the check engine connector jumped at TE1 and E1.
12 degress after top dead center
Ignition Timing degree B.T.D.C at idle speed 20 degree plus or minus 2 degree
18436572 same as all Chevy v-8s that is the firing order, not the ignition timing. timing varies between vehicles. a sticker under hood will give timing info, or a Haynes or Chilton service manual
Ignition timing is off.
To set the timing on a 1985 Suzuki GS700, first ensure the engine is at the top dead center (TDC) of the first cylinder on the compression stroke. Then, remove the timing cover to access the timing marks on the crankshaft and the ignition rotor. Align the timing marks according to the specifications in the service manual, and adjust the ignition timing using the idle adjustment screw and timing light if necessary. Always refer to the specific service manual for detailed instructions and torque specifications.
Generally, 8 degrees before top dead center is typical of Chevrolet V8 engines for many years including your 1985 model.
8 degrees BTDC ( or 10 degrees BTDC if high output engine )
The timing specification for a 1985 Ford F700 with a 370 V8 engine is typically set at 6 to 8 degrees before top dead center (BTDC) at idle. It's essential to check the specific service manual for the vehicle, as timing can vary slightly based on the engine configuration and any modifications. Always ensure the engine is at operating temperature and that the timing is adjusted using a timing light for accuracy.
www.motorcraft.com shows the ignition timing for a 1985 F-150 - 4.9 L 6 cylinder as ( 10 degrees BTDC ) If information on engine compartment sticker is different , use the sticker information
Automatic transmission - 10 degress BTDC Manual transmission - 6 degrees BTDC