However, for performance-minded buyers, Buick added a four-speed manual and a new 340-hp, 425-ci (7.0-liter) version of the second-gen nailhead to the list of options. The 1963 Wildcat looked very ...
Buick moved quickly, getting out the 425-big-inch V8, aptly named Wildcat 465, which was a Riviera-only option the previous year. Seven liters, 630 Nm, and a bump in power up to 340 horses.