Remove the #1 spark plug. Hold your finger over the hole while turning the engine over by hand. When you feel compression coming out past your finger, you are approaching TDC. Continue to rotate the engine until the timing marks are aligned.
0 TDC / Top dead center.
At zero. Tdc ( top dead center )
ZERO TDC / Top Dead Center
4 degrees before top dead center / BTDC
0 degress top dead center
8 degrees before top dead center.
The 0 part is the degrees at which it is set. TDC stands for top dead center. Your engine times at 0 degrees at top dead center.
0 top dead center.
0 degrees top dead center the computer will advance the timing as needed
8 degrees before top dead center.
6 to 8 degrees before top dead center. STOCK ENGINE
with a timing light, assuming this is an older engine that still uses a distributor.