Here is a video with the engine noise:
https://youtu.be/WgK9ID66zrQ
Ticking engine noise Camaro 2012 L99 with restored L99-engine with AFM delete but VVT running and COMP Cams MK189-301-13 - COMP Cams Stage 1 LST Master Camshaft Packages installed (hydralic lifters). Kit
https://www.summitracing.com/parts/cca-mk189-301-13 Car have run about 20 minutes with hot engine on idle (oil 5-30) but still ticking noise (lifters?). Exhaust not installed.