Well there was a L92, L9H, L94 LS3, LS9,LT1, LT4, LT5, L86, L87. These are LS and LT based 6.2s. I am probably forgetting some. I know I am.
All 6.2 liter displacement engines.
L87 replaced the L86 in GM trucks and SUVs.
L86 and L87 are almost identical but have different fuel management...