[king_midas]

The LT-1 was ready to go before the end of '69 Corvette production, and I think I remember reading somewhere that emissions decals and engine suffixes were made available for '69 Corvettes before the '70 production run began.

Interestingly, the L-46 was available in '70 also, which means that this mixture of engines does seem theoretically possible for '69 production (same reciprocating assy.).

Based on this, were any '69 Corvettes produced with the LT-1?