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Message: <blockquote data-quote="az97cobra" data-source="post: 1464354" data-attributes="member: 20252">This is my first engine assembly so I'm a little green obviously but I bought a Teksid block and some PI heads to put into a 97 mustang. I put a scope down the plug hole and I see what appears to be a small ring or imprint on the piston where one of the valves would be. The cam is a comp cams XE274H I believe from the cam inscription part number. On the comp cams website it suggests that the lift is .5Intake Valve Lift:0.5Exhaust Valve Lift:0.5From what i researched the stock cam had .505 and .535 liftI used a H591CP speed pro piston which has a dish but is not fly cut.Unfortunately I did not think the piston to valve clearance would be an issue so didn't check the clearance but is it reasonable that there is a clearance issue? I turned the engine over a number of times and never felt any resistance after the rebuild. Or is it more likely that it has jumped a timing chain gear tooth or I didn't line it up properly? I made sure I followed instructions and lined up the markings on the timing chain so it's hard for me to see how that is the issue. The imprint is on every piston though.thanks for the thoughts</blockquote>