criticalx

other day had a guy data log some driving around and few hits. after looking at data he says o2 saying its running rich but maf is showing it getting a lot air too. I know I need a wide ban o2 to check for sure.. but could valve lash or valve float cause this ?

cam a cc305 with 1.6rr = 544
spings was set for 550 lift.. not sure on spec on spring. I do know the engine pro dual springs. guy who done heads put them in.. thanks for help