1st set piston at top dead center, which is the top of its travel. after you have verified top dead center, and you are 100% sure its at top dead, install the cams. first the exhaust cam, with you facing the sprockets, with the cam lobes facing up and away, about the 10 o clock position. once set there, you should see a refrence on the sprocket, with lines that will be parallel with the cyl. head surface. then install the intake cam, with lobes facing in the 2 o clock position. once again, you will see refrence marks on the cam sprocket that should be level with the cyl. head surface. after the cam caps are installed, and the cam chain tensioner, turn the engine with the flywheel bolt to verify you have no piston valve contact. after you turn over a few times, recheck timing.