True horsepower?

ir3333 said

so a 1969 440 GTX was rated at 375 hp.
Would this be at the crank with accessories operating?

Click to expand...

Nope. At the crank, no accessories, open headers, no air cleaner, whatever fuel they wanted, and any tune they liked.

Net for this same basic engine was 280 in 1972. Probably about 230 at the wheels for both cars.