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On the other hand, the 429 Super Cobra Jet used wedge heads. Its mechanical lifters and 780-cfm 4150 Holley carburetor set it apart from the standard 429 Cobra Jet and gave it a little more power.

That would be the main reason why just 532 examples were assembled – the Eisenhower vehicle was chassis number 2, by the way – out of over 109,000 Cadillacs produced for the model year.