Replaced a 377 LS3 with a 418 LS3, static compression went from 10.7 to 11.9. DCR is about 8.8. Using premium fuel. Using new NGK TR6 plugs, unmodified gap. The passenger side cat seemed a little clogged when the engine was out, the driver side looked okay.
We're encountering some challenges tuning the new motor, I'm at the shop now. I've not gotten my NGK AFX lambda error config working again in V4, it worked previously in 2.24. Thus for fueling I'm using LTFT+STFT to adjust VE & MAF. But I didn't get very far, it seems to want to ping excessively even after LT+ST shows near 0 or rich. Maybe I just haven't spent enough time on it? The old 377 calibration had the misfire tables desensitized, I put them back to stock for the 418 calibration. I am getting some misfire codes, and ironically all the P0351-P0359 coil codes are also set, wondering what would cause all of them to set simultaneously.
Any guidance is appreciated.