The engine was rebuilt 30,757 miles ago. Work order indicates timing chain was replaced. This is a completely restored inside & outside vehicle, definitely a keeper. I'll crank the engine over today to reestablish oil pressure. I'm still curious as to why is see more valve movement (opening) when the cam lobe peak is rotated from perpendicular (1 o'clock position) to the 3 o'clock position. The procedure I've read say's set the dial indicator when the cam lobe peak is perpendicular to the rocker arm.