[troll]

If your pulling a horse trailer up a big long mountain you will need the vacuam advance other then that dont use it.Weve lost some much of that over the years.Model T's had a timing lever on them.If you didnt turn it down while pulling you would over heat the pistons.The vacuam advance replaced that.If your just driving around drop the timing way down.If your looking for power then turn it up high,but dont leave it there.Get a mechanical that way you timing will stay with the RPM up to 2500 RPM even at WOT.WOT the vacuam drops off and goes back to static + mechanical anyway ,thats what they do and why they are there.Cool pistons all day,and hot pistons for racing.High advance will kill your starter motor it will start preigniting and you wont hear it.I had a 289 HiPo when I was younger it had no vacuam controls and no trialer hitch.