w8ye

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Piston Top Dead Center with the dot straight down

To check yourself, then turn the crank 360 degrees and both valves should be exactly evenly open. One is closing and the other is opening. If you look across the tops of the rockers arms from the side, they should be even and parallel with each other.

Turn the crank another 360 degrees for the compression stroke and the point where you adjust valve clearance.