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on petrol ecotec engines two liter vectra b , its marks on top of valve cover above camgears, aligned with marks on the timegears, also other mark on the gears align where the gears come close to each other, and a mark on the crankshaft pulley for the serpentine and timing belt behind thepulley, aligns with a needle mark a bit to the side to the right. do not turn the camgears while timebelt is off with any force, I did that and seem to have bent a valve maybe. to prewent that you can use a locking tool on the camgears, I was too cheap to buy that , the haynes book is not expensive and has detailed instructions. also I would advice to take spark plugs out first, then you dont get into a habit of turnig the engine with a wrench with force , also you can see the position of the pistons through plug holes with a flashlight, while cambelt is on, put pisons in a low postiion before removing timebelt, then valves will hardly hit pistons even if you turn camgears by mistake. if you dont move the crankshaft. but I know little about this, maybe my directons are faulty, safest is to do it by the book.
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