What's displacement after the 4" stroker? What vendor for the rotating assembly are you using?
While there are always a ton of parameters that affect pinging, I can say my H&C LSx is "supposedly" around 11.1:1 and it pings on the summer blend under load. I have to use a little Torco to bring it up to around 93 (estimated). That may go away with less restrictive exhaust because of back pressure issues, but in CA, 11:1 on older style setups (e.g., not DI) is sort of on the margin maybe..
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