The 1975 Pontiac model year proved to be significant for a few reasons. It marked the addition of catalytic converters in most models to further reduce exhaust emissions. The addition of these new devices required the use of unleaded fuel to prevent damage to their internal components.
The 1975 Pontiac was the last year for the
Also, the convertible body style made its last stand at Pontiac -- for a decade, at least. With a declining market for droptops having gradually reduced their numbers in America, a business case for the convertible could no longer be made.
Additionally, the Bonneville four-door sedan and Catalina four-door hardtop were dropped from the lineup. Also, Radial Tuned Suspension became standard on all full-sized models.
New rooflines were instituted throughout. Bonneville and Grand Ville Brougham (a new name) coupes received large fixed quarter windows and B-posts that went all the way to the door glass, while four-door hardtops added small "opera windows" in their rear pillars. A fixed-position vent window added more glass area in the rear doors of Catalina sedans.
Rectangular quad headlamps, a new trend for upper-level GM cars, were found on Bonnevilles and Grand Villes, which also shared a revised grille and taillamps that newly wrapped around the fender edges. A new six-element grille graced the front of Catalinas. Wheelbase for all models but wagons was nudged back to 123.4 inches.
Due to tighter emissions regulations, powertrain offerings got a bit confusing. The 400 with twin-throat carb was still the base powerplant for nonwagon Catalinas and Bonnevilles sold everywhere but California. The 400 four-barrel came standard in all California-bound Catalinas and Bonnevilles, "49-state" station wagons, and all Grand Villes. The 455 was standard for all wagons sold in California and was optional in all full-sized models. The compression ratio of all engines was scaled back to 7.6:1.
To learn about the 1976 Pontiac models, continue on to the next page.
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