All Buick V6 engines came from the factory, in Olds A/G-bodies, with 2-bbl Rochester Dual-jet carburetors. They had two throttle bores and a hot-air style choke. Rated power was 110 hp @ 3000 rpm and torque was 200 lb*ft @ 1600 rpm. As with everything from the factory, there is a compromise between many factors such as driveability, emissions, performance, and mileage. The 3.8L V6 is an efficient engine and should produce years of trouble-free duty.
However, there are a few things which can be done to these engines to make them a little more peppy than what GM had in mind. One of the most popular upgrades is changing the induction to a 4-bbl carburetor and intake manifold to match. If you are intent on keeping the computer on the vehicle, there is a fairly easy solution: install a Rochester Quadra-jet carburetor and 4-bbl intake manifold from any early '80s Riviera or Toronado with a 4.1L V6. These engines shared the same basic block as the 3.8s, but had a slightly larger bore to achieve the 4.1L displacement; they also had a Q-jet carb and 4-bbl intake, which, in combination, is a direct bolt-on to any 3.8L engine.
Other options are looking to third-party manufacturers for performance products. Both Edelbrock and Holley manufacture intake manifolds for these engines. They both provide provisions for either a spread-bore carb (like the Rochester Q-jet) or a square-bore carb (like most Holleys). The recommended CFM (Cubic Feet per Minute) rating for a 4-bbl carb for these engines is between 390-cfm and 600-cfm.
|Table of Contents||Back||Top of Chapter|
|Copyright © 1998-2021 by The Members of The Oldsmobile Mailing List. All Rights Reserved. This web site is not affiliated with General Motors or Oldsmobile. General Motors and Oldsmobile are trademarks of their respective companies. The owners and members of this site are not responsible for errors or inaccuracies.|