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The camshaft turns at half the speed of the crankshaft. If you count the gears, you should find that there are twice as many on the camshaft. If you line up the marks at TDC, then turn the crankshaft 360 Degrees, you should find that the camshaft has turned 180 degrees. So, every time the crankshaft turns back around to TDC, the camshaft will turn 180 degrees and if that's what your're seeing, then everything is normal.

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Q: Where does the timing gear marks line up on a 1998 Chevy pickup 350 Do they line up ever revolution or can they be 180 off?
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