i run an A-trim with the S-trim impeller upgrade (still an A-trim housing). i put on the 2.95" pulley and was getting around 10-11 psi in hot weather with the crappy stock plastic intake hose and no bypass. i just put on a 10 rib 2.5" pulley, race bypass, and intake tube i cut and made for about $30. just got it running last week, so no dyno, but so far its putting out a little over 18#s. if you do get a smaller pulley or even keep the one you got, shot peen the surface that the belt touches to make it a little more abrasive and you can gain boost by preventing slipping at high rpm. its not bad for the belt at all, and the crank pulley i got from vortech for the 10 rib was already done, dont know why they dont catch on and do the blower pulley
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88 Conv Vortech S-trim 2.5" 10-rib pulley, 332 stroker w/ Cat forged crank, forged JE flat-tops, forged rods, 10.25:1 comp, DSS girdle, edelbrock heads, Omega valvetrain, Lunati custom cam, extrude honed Cobra intake, 70mm T-body, Pro-M 77, bypass valve, dual Walbro 255 lph in tank pumps, an -8 fuel hose, aeromotive fuel rails/regulater. 42# inj, MSD ingniton/boost retard, JBA headers, flowmasters, full Griggs GR-40R suspension (K-member, torque arm, panhard bar, subframes, strut brace) Centerforce clutch, Tremec, Auburn posi locker, moser axles, Baer brakes/rotors, 17" cobra R wheels, custom body/roll bar
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