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Top dead center (TDC) is when the number 1 piston is at the very top of it's stroke on it's power (firing) stroke. This holds true for ALL internal combustion piston engines. If you remove the driver side valve cover, the second valve from the front is the intake valve on a small block Chevy, including the 305. Slowly rotate the engine by hand. When the intake valve closes, keep turning the engine until the timing mark lines up at zero. When it does, you are at top dead center.

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Q: What is top dead center for a 1985 305 Chevy engine?
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