So I have a beautiful 1988 cutlass supreme with a gen3 4.8. I just did the AC and kept it all original to the car, except for used a pancake r4 compressor from a 94 c1500 instead of r4 from cutlass because it uses a 6 rib clutch for the ls. Replaced Orifice cleaned all the lines replaced the accumulator,Cleaned out Evap and condenser. Primed system with oil pulled 30 in of vacuum for 30 min. Held that vacuum for hours. Charged ac and compressor got really hot, smoked brand new compressor. Metal in orifice. So I Just replaced everything AGAIN including compressor, orifice ect. everything went fine again and yet again instantly smoked my brand new @&$@?!! compressor😑😑 I’ve been a professional mechanic in southern Arizona for over 8 years. I’ve done HUNDREDS of ac systems and have never had a issue besides maybe missing a bad seal and not holding vacuum. Go to do my own on my beautiful pride and joy. Alll the problems 😂 I really need some help here. I had some ac bracket alignment issues originally. I had to shorten all the spacers for the AC bracket 3.15 mm to get the belt lined up correctly. I got it within thousands. Not sure if a VERRY very slight misalignment of the ac would smoke the compressor? The belt tracks good and I’ve drove it for days without compressor Engaged, no issues with belt or alignment and the ac clutch pulley doesn’t get any hotter than the Idler pulley so no issues there. Only when I try to engage it’s not happy. Pretty sure my Orifice is filled with metal again I’m afraid to look.