i perfer at least 91 or above for anything b-series. i ran 94 all the time in my GSR motor, but i'll run 93 or 94 in my LS. my d16 that was in my car stock ran better (no valve tapping) with 93 but i didnt give a shit about that motor so i ran 89 (valve tapping and all)

id never run 87 in anything of mine