Pleeease do not bank on this, but I have been told/read that a BASE 10-compression Buick 455 makes @ 400-horsepower. I have also been told/read that ... ONLY A DYNO CAN TRULY TELL. :TU::3gears: (I just asked my engine builder the saaaame question ... AGAIN last week ... while knowing better. I know how it is, my friend). lol