* Base 326 (2-bbl): This engine produced 165 horsepower at 4,400 rpm and 265 lb-ft of torque at 2,400 rpm.
* 326 (4-bbl): This engine, with a four-barrel carburetor, produced 215 horsepower at 4,800 rpm and 295 lb-ft of torque at 2,800 rpm.
* 326 H.O.: This high-output version, also with a four-barrel carburetor, produced 230 horsepower at 5,000 rpm and 300 lb-ft of torque at 3,200 rpm.
To know the exact horsepower rating of your 1965 Pontiac Tempest 326, you will need to check the vehicle's build sheet or owner's manual. These documents will provide the specific engine options and horsepower ratings for your car.
