John, my 255 has been dyno'd last year... I ran it in my Vicky in June, Sep and Oct last year at Maxton,
6 runs, 5 records in 3 classes,, not bad for my first attempt they say... The motor never saw it's full potential due to poor areo on the Vicky, poor gear selection and me using a 3 speed auto,,,
That motor will do much better with a 4 speed and my new Quick Change Rear..
I shifted from 2nd to High at 8200 rp, and it dropped back to just under 5000 on the shift and pulled good but got to the finish line at only 6500.... By using 4 closer spaced trans gears and more gear in the rear, I know it will run better,,, add to that the Stude should have much better areo and handeling..
Oh yeah,,, 255 cubic inches made 502 HP (1.97 HP per cube) and she turns up GREAT... makes all her power from 5,000 to 8500