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Ahhhhh D'Oh!.... my bad I thought you were talking about a connecting rod connected to the crankshaft.
It could be a bad lifter or a lifter that collapsed and lost it's pressure. Depends more on how much noise did the engine make while running? It's possible the exhaust leak you "thought" you had was actually the lifting ticking. Hard to say over the internet.
With the way cams and lifters are behaving these days I would say reinstall things the way they were. Repair your exhaust leak and see if the lifter ticks.
Otherwise you could pull the intake and replace the lifters and pray they don't wipe the cam in the process.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.