Do they makea serpentine belt system for a 1978, rear wheel drive 3.8 V6? If so, where can I purchase it?
GM does (did?) make a serpentine belt system for their 3800 motors, it was the same setup on all their Buick, Pontiac, Chevy and Olds cars, that started in the mid 80's - I want to say 1985. So maybe hunt around for a post '85 3800 motor for it's serpentine belt system? Otherwise you can always find a serpetnine belt system upgrade kit at Summit racing, but those kits are not cheap.