In a message dated 1/22/05 9:33:59 PM US Mountain Standard Time, chelvis@camano.net writes: > Can anybody tell me what differences there are between a set of 140 HP > non-smog (No A.I.R) and smog (A.I.R. equipped) heads? > Bill, the smog 140s had stainless steel exhaust tubes. Regards, Bob Helt