The luxury automaker would then make the 429 cubic inch engine by increasing the bore and stroke on the new 390ci engine. Even with those modifications, the stock horsepower on the Cadillac 429 ...

Cadillac went even bigger ... up from 340 in the old 429 engine. But low-end torque mattered more than outright power to the domestic customer, and the 472 delivered on that front with 525 ...