TDC, top dead center is when the number 1 piston is at the top of the cylinder. 8 degrees before TDC is where you set the distributor so that is when the spark plug fires. You use a timing light to set the distributor. There is a timing mark on the crankshaft pulley and a series of marks on the timing chain cover that will show where 8 degrees before is at. The timing mark on the pulley is a small notch in the edge of the pulley closest to the timing cover.
8 degrees before top dead center.
Set timing at 36 degrees at 2000 rpm's
The timing will be 8 degrees before top dead center i believe although my 86 2.8 says it is 10 degrees before tdc
16 degrees before top dead center
Stock timing is 6 degrees before top dead center.
8 degrees BTDC-- Before top dead center.
15 degrees before top dead center
6 degrees before top dead center.
8 degrees Before top dead center.
8 degrees before top dead center
Generally 4 degrees before top dead center with the vacuum advance disconnected.If you have access to an advanced timing light then 35 degrees total is ideal. All manuals refer you to the sticker on the radiator cowl......There it states that the base timing is 6 DEGREES BEFORE TOP DEAD CENTER (DR).
0 degrees in drive bypass disconnected