New Magnum heads for 347 with Flow data

After further scrutiny of the exhaust ports I decided I would spend a little more time on them. I don't want this engine to fall off very quickly after peak power. Here is one thing I have done in the past that is cheap (free)and just about anyone can do it. I chucked an exhaust valve in the lathe and hit the backside of the valve with an 80 grit sand roll.I also like to round off the margin which usually promotes flow as well. If I can get the exhaust out with minimal pumping losses then this should help the engine exhibit a very wide torque curve. I haven't quantified the effort on the flowbench yet but will soon. J.Rob