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The small blower was probably done for the same reasons as the bad old days. The Corvette is the halo car and has to be top dog in performance.
If GM gave the ZL1 the LT5 with the larger blower, then the upcoming ZR1 would be diminished in many performance aspects not to say what it would do to the current Z06 model.
In my opinion, the new ZR1 deserved something a lot more special than just another pushrod V8 with a blower on it. A modern, direct injected, DOHC, VVT, 32V V8 would have been my dream engine for that model.
It would have kept the "LT5" designation true to its original marketing heritage instead of becoming just another pushrod V8 with a blower on it. As a side benefit, it would have allowed the ZL1 to grow in performance with the LT4 while keeping a safe comfortable distance between it and the ZR1.
Unfortunately, GM has never been regarded as making very many good long-term decisions.
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