Horsepower on a 366 big block?

Answer 1

A 366 big block Chevy usually had between 220 - 262 hp and the torque usually ran between 450-510 they were a very low end torque engine they were built for nothing else but pulling they were put into medium duty truck usually from 2 ton to 3 ton trucks. They are a tall deck engine with a small combustion chamber and small valves for a big block but very high output at low rpms. They had a bore of 3.935 and had a stroke of 3.760 they used three compression rings. One of the major flaws of the 366 was that when you would down shift pulling heavy loads up a steep grade the heat in the combustion chamber would burn holes threw the valves because of high out put but now were for it to go.