Posted a message a couple weeks ago about a blown engine in my '77 280Z. Most everyone seems to think I ran a cylinder dry. Since then I've pulled the fan blade & rocker cover, turned it manually after putting MMO in the plugs to free up the cylinders. It turned with no problem until I hit TC & then it jammed so I'm thinking I heated up the head & distorted it. I can see evidence of burn on the cam-lobes but until I pull the head I won't find my problem. My question is, how do I know if my piston rod is bent without pulling them out? Tom Monroe's book on rebuilding OHC's is very helpful, but doesn't go into great detail about diagosing my problem (unless I'm just missing it!). I'm not sure how far I need to go - pull the head & secure the timing chain w/ wood block or just pull the timing chain because I'm going to end up rebuilding the whole thing - what tell-tale signs should I be looking for? Thanks for all your help.