Help!! I was doing a valve adjustment today. Installed new shims and valve clearances are within spec tolerances. Torqued everything down and rotated the crank two times and then realized I had forgot to install the chain tensioner. I don't think it jumped time on the camshafts. Camshafts lobes appear to be in correct position. How do I know I'm still at TDC? Can the piston be seen throught the spark plug housing within the head? Or am I just freaking out for no apparent reason. Need advice please. I'm afraid to rotate engine or button it up because I'm unsure what I have done.