[67shortie]

Not to start an argument, the Gibbs cars were built by Chevy as a factory racecar, ZL-1, all aluminum 427. The price tag of the car was VERY expensive for it's day. The sales mostly went to racers, and a few found thier way into Corvettes. 500 hp was not a uncommon # for these engines. The reason was simple for this swap, less weight=quicker et's and faster around the track.

Not my knowledge, there was no such thing as a 'double copo'

The iorn 427's were factory installed and ordered by dealers as a special 'dealer built' car. Yes, some 427's were installed at the dealers, but most came from Chevrolet that way. Heck they even had headers shipped with them in the trunk for the serious racers and street cars. The buyers could get just about anything they wanted back then......from the dealers and Chevrolet.