[GMH454]

Thanks Joe, knew I could rely on you. Some very interesting stuff there. Have you seen the photo I am talking about, it would be around 1967 and has I beleive, the winged coupe in the back ground with a ZL-1 on chains in the foreground. Sure looks like production ZL-1 from the outside .
Not surprised that they could not handle the Can Am work load, but it might not have been just the revs but the 3 hour race duration that was the real killer. I still think he won a 6 hour enduro in England with it so it was no grenade. Got to think that those blocks would flex a bit, the chassis were not that strong. I beleive with injection those engines would produce near to 700lbs of torque, this lack of endurance reliability was also a constant problem for the Vettes when running cross ram injection , until they went to Yenkos (beleive Pickett won the Trans Am in 1978 against the 934 Porches with a Yenko, probably the BB Vettes last win). Was Yenkos ZL-1 detuned, Bob Jane detuned his to 11-1, so it would live in the Aust touring car season. Only lost one engine in 2 years.

You constantly hear the 2 engines are different, but not sure they would have needed to be. Could just be another Chevrolet myth.