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Ren Man: About using "stiffer" (higher rate) Z28 springs on a HiPo head, they are not needed. Too stiff on the valve spring springs and the result is undue wear and wasted power. I say not needed because my hp289 with stock springs goes to 8,000 rpm and closes the 1.94" intakes with a 0.510" lift cam. As for "hesitation", I'm not sure what you mean. All a valve spring has to do is keep the slack out of a valve train; lifter on the lobe, pushrod on the lifer, rocker arm against the pushrod and so on.
Good luck with your small block. A big blocks with gobs of torque is nice at the bottom end, but a small block that pulls strong up into the 7,000 rpm range is sweet.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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