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The 1965 Pontiac 2+2 was the W51 performance package for two Catalina bodies: the 25237 Sport Coupe and 25267 convertible. It was not a separate VIN series. The package replaced the regular Catalina powertrain with a 421 four-barrel, dual exhaust, a floor-shifted three-speed, a performance axle, heavy-duty springs and shocks, bucket seats, full carpeting, and 2+2 identification.
The standard 421 used a Carter AFB four-barrel, 10.5:1 compression, hydraulic lifters, and factory ratings of 338 gross horsepower at 4,600 rpm and 459 lb-ft at 2,800 rpm. Buyers could step up to a 356-hp Tri-Power 421 or the 376-hp 421 HO, which added its own camshaft, valve springs, exhaust manifolds, low-restriction air cleaners, and declutching fan. These are configurations within one 2+2 page, not separate model identities.
The standard manual was a fully synchronized three-speed with a Hurst floor shifter and 3.42 axle. A wide-ratio four-speed, a close-ratio four-speed with 4.11 gearing, and Turbo Hydra-Matic were available. Automatic 2+2s used a 3.23 standard axle. Safe-T-Track was optional. Underneath, every 2+2 used Pontiac's 121-inch-wheelbase perimeter frame, independent front control arms, four-link coil-spring rear suspension, and 11-inch finned drums; the aluminum eight-lug hub-and-drum setup was optional.
The package also changed what occupants saw and touched. Expanded Morrokide bucket-seat interiors came in black, red, blue charcoal, or parchment-and-black combinations. Outside, 421 and 2+2 emblems, lower front-fender louvers, pinstriping, lower-body molding, and specific wheel covers separated the package from a regular Catalina. All 15 Pontiac exterior colors were available subject to the factory trim-combination chart.
Pontiac built 11,521 W51 cars: 5,316 with synchromesh transmissions and 6,205 with Hydra-Matic. Surviving records do not provide a trustworthy hardtop-versus-convertible or engine-configuration split. Authentication therefore starts with the correct 25237 or 25267 body and an individual PHS billing-history or invoice record showing W51, then checks the engine, transmission, axle, paint, trim, and component dates. Badges, louvers, a 421, or a Tri-Power intake support the inspection; none proves a 2+2 by itself.