There are a number of choices of donor vehicles for the serpentine brackets and pulleys that utilize the R4 a\c compressor. 1987-1992 F body V8's and 1987-1993 Z code S10 trucks seem to be the most popular. The oddest was the late 80's trucks which used a cast iron bracket rather than aluminum. 1991-1993 B bodies and early 90's trucks are other alternatives. All of the choices that utilized the R4 a\c compressor placed it on the left side.
The S10 brackets mounted with conventional bolts while the cars used star socket bolts. You'll need a special tool to pull the PS pump pulley. You'll need 4 special tools to pull the a/c pulley. You'll also need a 1/4 socket to remove the two studs that hold the brackets to the heads.
An issue with some but not all truck brackets is lack of smog pump mounting. Below is a S10 right side bracket
The left side bracket is similar to the F body and B Body
Some late 80's trucks used cast iron brackets similar to the V belt setup. I noticed some of them had stress cracks which was the main reason I did this swap. My V belt PS bracket broke twice in the last 3 years.
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An interesting alternator bracket was from a 1989 Caprice 9C1. It was larger than the CS130 bracket. Did it fit the old SI or a larger CS144?
I used the drive system from a 1989 Camaro with a 5.0 TBI motor like this one.
I highly recommend taking a Sharpie and baggies to collect each bolt, nut washer and label them. Don't forget to get the one alternator support and two compressor supports. These are cast iron pieces that bolt to the rear of the serpentine bracket. I didn't have room on my V6 for the compressor to exhaust manifold support. The compressor to intake support worked fine.
Finally, there are several ways the belt gets routed. This is the only routing that worked for me.
GM used a combination serpentine belt for the alternator and V belts for everything else in the mid 80's. The setup below is off of a 85 TPI Camaro. This is very similar to the 4.3 V6 TBI setup. I kept the existing crankshaft pulley (serpentine-V belt combo) but have been having issues with the belt splitting which wasa resolved by using the serpentine pulley.
I thought I could use the existing crankshaft pulley. After loosing the outermost rib on two different belts, I went back to Pic A Parts to get a crank pulley. Here is a comparison of the two. It appears they are different by a 1/16. No sliced belts since the change!
This is the end result!
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