nice runs. 12.6 is where these motor make the best HP and around 12.9 they make peak tq. 27degrees of timing is also perfect for a 5.3
I was not going to say anything because i dont want you to lose faith or cause conflict with your tuner ......... BUT I agree with RADOV8 here. again i dont know how clean &/well maintained your tuners(/dyno guy) sniffer is, but this thing can definitely handle mid 12s A/F. my 2v modular motor makes its most power @ 13.2:1
Linear Mode
