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If looking at the engine directly from the front, the two large sprockets at the top are called the primary cam sprockets and both have mating marks that are punched on the engine block just above the rims of these sprockets. Another punched mating mark can be found all the way down below where the crankshaft sprocket is located.

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9y ago
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Q: Where is the timing chain marks on a Oldsmobile 3.5L?
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