Lineup included Bonneville sedan, Bonneville station wagon, and Bonneville Brougham sedan.. Base powerplant on all models was Buick-built 3.8 liter V-6. Optional 5.0 liter V-8, and 5.7 liter diesel V-8 optional on all Bonneville’s. THM 200C continued to be the only available transmission for Pontiac G-bodies. 1982’s 4.1 liter V-6 with 4-bbl carburetor was discontinued. … Continue reading 1983 Pontiac Bonneville Promo