mine ran like a bag of shit with the timing at 5e, i set it at 4e and its fine. the 5e marks on the cam, give a slight overlap on the valves. which is great for an NA engine. you need to spin em slightly to get them closed and to stop the overlap, which is good for turbos, hence the 4e marking. a perfect setup would be using the 4e markings, and having some fine adjustment on the cam gear itself to account for the extra height in the block. but that is effort. the 5e marks will work. but are not an ideal compression setup for a turbo. but you know, what do i know, its not like ive done it or anything, ivan said use the 5e marks so he must be right, hes a hero ;)