Back in the Nov. '09 issue ("Budget Serpentine Drive," pg. 42) we detailed how to convert a V-belt accessory drive to a serpentine system using junkyard parts. The main criteria are the accessory boltholes in the cylinder heads. In our story, the entire serpentine system came from an '80s and early-'90s 4.3L V6 or TBI 305 or 350 truck. We replaced the A/C compressor with a Dorman idler pulley from Rock Auto.