Ok guys.... I just got off the phone and spoke to two people.... First being Warren Dernoshek... most everyone is familiar with him because he worked at Yenko Chevrolet.... his exact words were ....We advertised the cars at 450 hp for the solid lifter 4 spd. and 410 hp for the hydraulic automatic.....but we did not have a dyno...he went on to say ...we tuned the cars but had no way to get exact HP ratings. That is his recollection. Then I called the original owner....and he said that they tuned the car ...but reused the heads, intake, and carb.....so there you have it ....exact HP was not really known but it was advertised that way by Don Yenko...We all know he was a salesman for his performance cars.
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