In the LT1 model, which was standard in the late 1960 Corvette, a factory 350 motor could produce as low as 145 horsepower or as much as 370 horsepower. The 1970s fuel crisis greatly reduced the performance of the Chevy standard 350 powerplant.
All the engines have the same displacement, but the LT1 had a well-tuned and complete performance fuel and exhaust system. To find out when the motor was manufactured and how powerful it is, look for an engine code on the side or rear of the block. In comparison to earlier generations, the Modern Chevy 350 is relatively fuel-efficient and produces about 250 horsepower.