Hey Cobra, a 12.2:1 A/F ratio might be okay for forced induction, but a little too rich for n/a. I don't think you'll gain 70 hp by resetting the A/F, but it would be step in the right direction.
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Russ L
'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.
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