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Not to be mean, but it is because it is a terrible engine in that application. Even with a 4 barrel it was only rated at 150hp and 240 pound feet of torque. Even the 4.3 liter V6 that came out a few years later had 130hp and 210 pound feet of torque. Thes were emission friendly economy engines. The only way to up the power is to change cams, and go to an aftermarket intake and carb or have a good rebuild on yours. The easiest thing to do if the motor is tired is to replace it with a good 350.

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Q: Why would 1981 305 engine truck lack power in pulling a hill?
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