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there shouldn't be timing marks under there, but anyways.....if you have a timing light, point it from the top at about 1-2 oclock towards the crankshaft pulley. there should be a reference mark on the timing cover/front cover that sticks out over the crankshaft pulley. there will be 4-5 teeth marks with a larger tooth mark. when setting timing, the timing mark should line up with the "bottom" of the large valley. you have to disconnect the distributor vacuum hose and plug it while you do this. timimg should be 4-12 TDC depending on the specs - check the label, valve cover or manual for the spec. you can, if you want, add 2 degrees from spec for a little more power. afterwards, tighten the dist bolt, recheck the timing mark, then reconnect the dist vacuum hose. adjust idle speed (NOT THE MIXTURE), if necessary, on the carb. reinstall everything ........... yer done.

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Q: Is there another set of timing marks on an 83 Silverado other than the ones you can see from below the truck?
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