Hopefully for your sake it is as simple as the o-ring. How many miles are on it? It wouldn't have hurt to put a bore gauge in the block & verify the cam journal diameters just for peace of mind. There are many variables here but check the most obvious first.
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2013 2SS GPI built & tuned 415, spec'd by Andrew Cammer. GPI ported intake/tb/heads, Tooley springs, CHE trunnions, Callies rotating assembly, Diamond pistons, GPI SS3 VVT, ATI 10% ud damper, Circle D 3800, Kooks ceramic coated lt's with green cats, Mishimoto rad & oil cooler, Derale trans cooler, Holley efi rails.
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