[ERA Chas]

That makes more sense. If the rings are good I think around 400 for a 351. The design of the Windsor SR head (iron or aluminum)means 2.02" x 1.60" valves and 200 cc ports which is better than stock. The exhaust port has a better shape and direction than stock also. They are, however, about 30HP shy of AFR 185's and a lot shy of the 205's, out of the box. They would work better with more cam.