[KingLT1]

They don't detune anything, They just run a bigger pulley and less boost to make the same power as a stock ZL1. LT1 will make similar power @ 7psi as a LT4 @ 9psi due to the differences in compression. 11.5:1 vs 10.1. The thing is the LT1 fuel system runs out of steam fast and it becomes fuel system and octane limited on 93(due to high compression) pretty quick...I would say around 8psi you better start thinking about upgrading to the LT4 fuel system and run a mix of E85 or add Alky injection with 93. The LT4 can go pretty far on 93 octane alone.