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A C20 is 3/4 ton, so it isn't a Heavy Half.A Heavy half is a half ton C10 with 3/4 Ton rear leafs.
Someone most likely removed the catalytic converter. See 1986 Service Manual in the tech section, section 6F-3 (page1079).
Quote from: bake74 on July 04, 2014, 07:24:44 AM Someone most likely removed the catalytic converter. See 1986 Service Manual in the tech section, section 6F-3 (page1079).I had a 1986 C20 parts truck that had no catalytic convertor but it was a stick shift with dual air pumps and factory dual exhaust on a 5.7L. I have all the parts for my 86 C10 but I am going to put dual cats on it for my emission test
No cats from the factory the exhaust shop will not require you to buy them. You may need to bring along proving info like decoding your vin ahead of time and the fact your gas gauge doesn't have "unleaded fuel only". Have that conversation ahead of time so there are no surprises. Both my 85's still have the original dual exhaust system so I haven't had to go that route yet