Underdrive performance W/O alt. pulley.

[NO SLO PK]

Agreed, the difference in power with the stock vs. underdrive alternator pulley is negligible, in my opinion. I kinda doubt you'd see much of a diff. on a dyno. I've run with two pullies, but I think I had to use a shorter belt.

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'91 LX
Procharger, 3 row intercooler, extrude honed Cobra intake, Mac full Length Headers, 30# inj., 73mm C&L, 75mm tb, E303 cam, 289 rods, ported E7 heads, MSD, T-Rex w/255 lph Walbro, 5 lug conversion, Cobra R wheels, 3.27 gears and Moser Axles.