Shaquille O'Neal had a 116.4 offensive rating in the 2000 NBA Finals.

shaquille o'neal ortg and drtg 2000 finals
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NAMESEASONSERIESTMGPORTGDRTGMPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Shaquille O'NealShaquille O'Neal1999-00NBA FinalsLALLAL6116.4110.045.538.016.72.31.02.72.216.026.261.10.00.06.015.538.7273228100146161320+8
StatMuse has game-level data for offensive rating going back to the 1978 Finals.