Coastering is removing the air valve, hoses and puting a cover plate on the cylinder head. The air switch vac hose connects the rear carb vac port. :beerchug:Does anyone know where to route the vac hose from the air valve. I only know of 5 nipples on the carbs. Two fuel, the two that go to the right ear, and the hose that goes to the pet-cock. And what is, coastering?