180 horsepower at 3600 RPM and 325 ft/lbs torque at 1600 RPM ( according to my
Chilton repair manual )
the basic engine 250-ci V6 is rated at 145hp and the 400ci V8 at 170hp
Pontiac had no big blocks. all Pontiac engines are the same size externally (except the 301, it was a little smaller.)
In 1967, the Pontiac GTO received a mechanical upgrade. In addition to both new interior and exterior features, the engine was also upgraded to a 335hp 400ci engine with optional ram air.
Assuming you have the original 400ci, 4 barrel, 4 speed trans you can look forward to around 10 miles to the gallon. If you can keep your foot out of it...
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Better heads along with a different intake and carb. Bigger exhaust. A different camshaft. You would be the better off going to a 400ci.
400ci is about 6.5L
a 400ci engine
11 miles to the gallon
12 degrees before top dead center.
Available engines were- 105hp slatnt 6 150hp 318ci V8 240hp 340ci v8 175hp 400ci 2 barrel v8 260hp 400ci 4 barrel v8 280hp 440ci 4 barrel v8
i think it is 150 to 200 standed at the motor but opened up you get 400 at the motor