The LS6 engine was used in Chevelle ... the manufacturer instead elected to sell them as crate motors. While it's unknown how many were sold, some still crop up on auction sites to this day.

At 454 cubic inches, it delivered more cubic inches than Chrysler's 426 HEMI and Ford's 429 Boss big blocks, and it generated ample power in the Corvette with the LS6 454 engine rated at 450 ...