I have had a 1981 winnebago for nearly a year, with a chevy 454(engine was manufactured in Nov. '80) I am curious, what is the emissions routing? can anyone point me to a link. This engine appears to have the engine brackets for an A.I.R. Pump, but no pump was on it. It has a Rochester Quadrajet 17080212. Part of what i want to know is; is this engine supposed to have an air pump, but was made to operate without it somehow? was operating without it?