also , im sure many people have noticed by now. once you have your engine timed properly. if you look at the hash marks on the inside of each cam gear that point at one another , that dont exactly line up. they are a tad bit off. they are both horizontal , but not exactly pointing at one another. when you set your timing , your exhaust cam gear dot will point straight up vs the head , the intake cam dot will point slightly towards front of engine.