Yes that's what I thought too, 15hg is low. I always thought around 18-22hg. I don't know exactly what Ford specified in the service manual, its just something I read online on another forum. The reason I'm interested is I just rebuilt my K code and I've got a solid, steady 16hg on the gauge. The motor runs really strong, will smoke the tires all day long and idles smooth as silk. I live just outside London so Im at no altitude. So could it be the K code cam that ford say 15hg of vacuum? Or after only 420 miles maybe me rings have not bedded in yet?
Thanks Frank
John