Quote: I would doubt it. Nascar cup engines are probably as highly developed as any n a two valve pushrod engine. Pro stock engines are probably comparable in terms of development. In any case 355 cid cup engines are generally thought to produce roughly 830-850 hp. At 850 hp a 355 cid engine is producing 2.394 hp per cu in. Since engines of the same basic design generally produce less hp per cube as the size goes up it seems to me that even with multiple carbs and freedom of design in the intake manifold 2.68 hp per cube at 410 cid would be very difficult to achieve.
Remember cup motors have flat tappet cams and small carbs with no valve train or induction restictions a good comp elimn engine builder may get close but it would be as high maintenance as a playboy bunny
