There are many things that don't show up on the flowbench that make power, less mass at the valve is one of them, larger pockets(not Yours, the heads) is another. There are times where digging around the pocket roof doesn't reward You with any CFM candy, but still improves output. Control of the valve mass always improves output, the degree depends on how bad it was, & how much the improvement net is. Right now My plan is based around 8mm stems w/LS tool steel retainers & 26918 beehives, 1.81/1.48, the intake valve combo actually weighs less than the stock puny combo.
