How does cid make power?

Well smog 440s are what, 200hp and 480ftlbs. Vs their muscle car 6 pack (barrel if Plymouth lol) brother that made 390hp and same torque.


Kind of my point a different displacements somewhat guaranties a certain amount of torque but hp could be very low to high, building a 440 doesn't guarantee more power than smaller engines like it somewhat does with torque.

If hp was tied yo cid the hp per cid range would be smaller.