The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - WTB

ZOOMY · 03-31-2004, 07:30 AM

I think the air pump ones came out in '69. The idea was that if you pumped air into the exhaust gas mixture, it would totally burn the excess hydrocarbons off. It took power to run the air pump though which meant you had to hold the gas pedal down a little bit more which in turn put more hydrocarbons into play. If you want to trade, I'll trade, but they aren't period correct for '68. The air lines can be removed & plugs screwed into the holes........Zoomy

03-31-2004, 07:30 AM	#4
ZOOMY Senior Member Join Date: Feb 2003 Location: WIS Posts: 1,752	manifolds I think the air pump ones came out in '69. The idea was that if you pumped air into the exhaust gas mixture, it would totally burn the excess hydrocarbons off. It took power to run the air pump though which meant you had to hold the gas pedal down a little bit more which in turn put more hydrocarbons into play. If you want to trade, I'll trade, but they aren't period correct for '68. The air lines can be removed & plugs screwed into the holes........Zoomy