engine horsepower is the total power produced by an engine.whereas net horsepower is the remaining power after power loss from many reasons..in aviation, they call brake horsepower.
20.8 Net HP 24.47 Gross HP
266 is the Net Horsepower Rating of the 'M' or 'Q' code 1972 351 Cleveland engine. The 'R' code engine was rated at 275 net HP in 1972.
Around 280 net hp
The Factory5.7(350) V8 Vortec was rated at 255 net hp @4600rpm and 330 net torque @2800rpm
The American manufacturers don't go by gross hp, they completely changed to net hp in 1972. Net hp for the 1985 Chevrolet Corvette is 230hp.
hp=horsepower
With the 232 ci engine, 100 HP.With the 258 ci engine, 110 HP. With the 304 ci V8 engine, 150 HP. With the 360 ci V8 engine, 175 HP. With the 360-4 V8 engine, 220 HP. With the 401-4 V8 engine, 255 HP.
Engine displacement: 4093 cm3 / 249.8 cui, advertised power: 82 kW / 110 hp / 112 PS ( SAE net ), Torque net: 251 Nm / 185 lb-ft
There was a 42 HP and a 52 HP engine available.
15 hp
Engine displacement: 2287 cm3 / 139.6 cui, advertised power: 58 kW / 78 hp / 79 PS ( SAE net ), Torque net: 163 Nm / 120 lb-ft
I believe it is 285 hp.