I'd have to say that everyone has had great choices. Frank's original question was "What do you feel is the most significant single CHEVROLET performance car in existence?"
No offense to Frank, but the word "significant" has too many broad meanings to all of us to really agree on just ONE. Some have interpreted it as the most significant one for "them" personally which got them into the hobby with such focus, others have picked the highest horsepower, or the very first OHV V8. My pick hinged on Chevrolet's most complete racing package ever offered under one RPO. (and by the way, I stand by that; the L-88s nor the Z-06 Corvettes, nor the ZL-1s were offered with an overall package of race-only features as was the Z-11).
Does that mean the Z-11 was the most "significant"? No. It just fit the criteria I used to answer the question, as each of the other cars mentioned fit the criteria of the people who mentioned their picks.
Verne
