Maybe 3 is fine. I got in touch with Todd about this. Said the customer was fine with the 3 angle. Car still ran strong. I had a set of indy 360-1 done up by Dwayne Velder for my small block. You could see all the angles real easy. The valves also had the back cut. Dwayne did a nice job on those heads and there were at least 5 angles.