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The timing marks are at the front passanger side of the engine on the timing chain cover. It helps to mark the line on the balancer with chalk or white paint to make it more visable. To ease reaching the timing marks you can use Spak plug #6 on Pontiac V8s it is 360 deg opposite of #1 and will give you the correct timing. (Each cylinder only fires every 720 degrees of crankshaft rotation, so the timing light only shows every other time the mark on the balancer goes past). Pontiac used a removable sheet metal timing tab after about 1976 or so. They are sometimes missing if the engine has been disassembled. They are available from the aftermarket. Here is a link to a picture of what you are looking for:http://image.highperformancepontiac.com/f/9480195+w750+st0/0302hpp_buyerbeware06_zoom.jpg

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Q: Wear is the timing marks on a 1977 Pontiac 400?
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