Depends on where you live and what grade of gas you use, 12 degrees is safe all around.
www.motorcraft.com shows the ignition timing for a 1979 F150 with the 460 cubic inch ( 7.5 liter ) V8 , automatic transmission , as 14 degrees BTDC
Firing order is : 1 3 7 2 6 5 4 8
The Oldsmobile engines typically had a fairly high initial timing....coming in at 18-20 degrees before TDC. That's assuming you're talking about a fairly stock 403.
26-28 Before Top-Dead-Center (BTDC) in euro model at 3000rpmapprox. 8 degrees at idle
According to the 1984 Chilton's Auto Repair Manual,the ignition timing on all 1979 Ford 302s would be 6 degrees before top dead center.The factory allows a tolerance of plus or minus 2 degrees.
With automatic transmission ( 6 degrees BTDC ) With automatic transmission and dual mode ignition timing ( 12 degrees BTDC ) With manual transmission ( 10 degrees BTDC ) According to motorcraft . com
A 1979 Chevrolet pickup does not have a timing belt, it has a timing chain. The chain will last the life of the engine and is normally replaced during an engine overhaul.
10* BTDC for all 1973-1979 manual trans trucks, except California 6* BTDC for all 1973-1979 California trucks, auto or manual trans 6* BTDC for all 1973-1979 auto trans trucks.
There are no timing settings to set in a 1979 Grand Prix. The 3.4 L and the 3.1L and the 3.8 L that Pontiac used in its lineups all had computer controlled timing.
Remove the retaining ring from the top of your 1979 Chevrolet C 10 pickup truck ignition switch. Slide the ignition switch out and remove the wiring harness.
You will need to remove the retaining ring at the top of your 1979 Chevrolet El Camino ignition switch. The ignition switch will slide out. Remove the wiring harness. Reverse the process to install the new ignition switch.
Put it in park , insert the ignition key into the ignition and turn the key to start it.