Wind drag for sure won't have any affect on the wheel output when measuring rear wheel HP on a dyno. But it will affect the load going down the road.
For a typical IC engine, you get 1/3 of the input (fuel heating value) out the flywheel, 1/3 loss thru the cooling system, and 1/3 loss thru the exhaust.
FWIW, here's the certified HP curve for a 216 engine (from the 1951 Vehicle Info Kit - the 1950 didn't include that chart.) It notes what's not included (fan, generator, etc.)
Probably need to knock off 10% for losses thru the gear train (transmission and rear axle). So I'd say you get about 75 HP at the rear wheels under optimum conditions.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
