Valve Clearance on Larger Camshaft and Flat Top Pistons

Fish Bite said
Thanks. Duration at 0.050": Intake 251°, exhaust 257°.

That looks like a "Mutha Thumpr" garbage grind almost. Those cams are very inefficient. I know its not a CompCam but it looks like it--must have a very late closing exhaust for "that sound". J.Rob