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shorter the runners... the better for more power and higher rpms. I think the zr1 employs a dual runner system. At lower engine speeds it breathes through longer runners, and at higher the blades open the shorter runners. This has been studied for years by GM. The LS1 intake has longer runners which gives it more toruqe, but those guys know very high rpm will need a different intake... not really a concern with most people. Gm then made the LS6 intake different.. they realized that longer runners give torque but what is important is volume. The LS6 has increased volume inside of it. Take a look at the M5 engines intake... you'll see long trumpets and a HUGE intake the size of the motor. It probably has lke 8x the volume of the lt1 intake. thats why it makes excellent low torque AND high rpm power.
ANyways, the only way to really take advantage of the LT1/4 intake is to stroke the sucker and make it revv like crazy. :cheers: