0
TDC is 0( sometimes just a large line). A 4 cycle engine hits TDC or '0' once every 2 revolutions; So as the engine revolves, ( one revolution )it is at bottom dead center (BDC) then comes around to TDC to start the process over again. I hope this helps you. Mark
Answerthe "0" mark on the timing tab coincides with cylinder #1,the cylinder that is farthest torward the front of the engine.On a Chevy 350 this is on the drivers side.To varify if it is at top dead center or bottom dead center you need to remove #1 spark plug and determine weather the piston is at the top or bottom of the cylinder.One way to do this is to hold your finger over the open spark plug hole while someone turns the engine over slowly and feel for the blast of air to come out as the piston reaches tdc.If you have a distributor you can also determine where #1 plug wire needs to be by removing the distributor cap to see where the contact point of the rotor is pointing when at top dead center.this is #1 in the firing order.(18436572). AmswerLooking at my 350, the number 1 cylinder is on the passenger side front. The original Chevy intake manifold has the firing order cast in front of the carb, and the cylinder numbers cast into the top of the intake channel next to the head.
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