Is the ticking on the head that was replaced? If so I would be doubly suspect as to my ear that sounds more like a valve train noise than DI tick.
Good luck - things like this can really be a pain to deal with.
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2016 Camaro 1SS Hyper Blue 6MT NPP
2010 Camaro 2SS Cam/Headers/CAI/3.91 gears
476 rwhp/440 rwtq (sold)
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