Grand Prix 3800 Engine Specs

by Jasey Kelly

GM's 3800 engine was used in several of their makes and models, including the sporty family Grand Prix sedan. Specifications and which trims received the standard or supercharged 3800 varied depending on model year.

Horsepower and Torque

The 3800 Series III engine, found in the Grand Prix, offered 200 horsepower for the sporty sedan base model. The supercharged 3800 Series III, found in the Grand Prix GT or GTP (depending on model year), unleashed 260 horsepower.

The 3800 and 3800 SC Supercharged engines offered 230 foot-pounds of torque at 4,000 RPM and 380 foot-pounds of torque at 5,200 RPM, respectively.


The recommended fuels for the 3800 and 3800 SC are 87 octane and 92 octane, respectively. The 3800 is rated at 20/30/24 miles per gallon (city/highway/combination), while the 3800 SC is rated at 18/28/22 miles per gallon.

Other Specifications

On the 2005 model, the maximum engine speed was 5,900 RPM and 5,800 RPM for the 3800 and 3800 SC, respectively. Compression ratios are 9.4:1 (3800) and 8.5:1 (SC), and each engine's displacement was 231/3,791 (cubic inches/cc).

About the Author

With a professional background in gardening, landscapes, pests and natural ecosystems, Jasey Kelly has been sharing her knowledge through writing since 2009 and has served as an expert writer in these fields. Kelly's background also includes childcare, and animal rescue and care.

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