Mine does it too, but its been so hot here that it hasn't been doing it lately. I took mine to the dealership and they kept it overnight, didn't tick for them when they kept it so they're not going to replace them unless they tick. I was told I might have to wait for cooler weather. I'm shocked that they would even consider replacing them since I am supercharged.
If you have aftermarket headers with cheap gaskets, a gasket leak sounds very similar. PQ posted a video with his ticking, he thought it was lifters and ended up being a header gasket.
Probably not likely if you have stock manifolds.
....I'm probably just going to have ATLPF do a LS3 conversion and forget about the dealer.
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