The right size serpentine belts to use on any swap is a difficult question to answer. It depends on what AC compressor is used, what alternator is used, what type tensioner is used, what supercharger pulley is used, what intercooler you have and more importantly how everything is mounted. Best to measure up with a tape measure and go from there. Jelly2M8 has it right.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE " [This message has been edited by Dennis LaGrua (edited 05-06-2025).]