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**THI** · 01-02-2022, 01:57 PM

1979 with Heavy-Duty Emissions would the Factory air cleaner with the stove pipe running up from the right-side exhaust manifold for the "heated air" to the carb along with a butterfly valve in the exhaust on the right side to aid in faster warm up (EFE). It would also have the AIR (Air Injector Reactor) system pumping air into the exhaust manifolds and would also have the vapor canister system. There would also be a Vacuum Control Switch on the thermostat outlet to control vacuum advance to the distributor. NO EGR or CONVERTER (but I think all that other stuff was more than enough!)

The Emission Control Sticker mentioned above would have been attached to the air cleaner on Heavy Duty Emissions vehicles (over 8,500 GVW) - without the original air cleaner, you will have to search to find one of those stickers that will not only show the Emission Controls, but also the vacuum routing and tune-up specs.

01-02-2022, 01:57 PM	#10
THI Active Member Join Date: Jan 2017 Location: Traverse City, MI Posts: 170	Re: c30, how to pass California emissions 1979 with Heavy-Duty Emissions would the Factory air cleaner with the stove pipe running up from the right-side exhaust manifold for the "heated air" to the carb along with a butterfly valve in the exhaust on the right side to aid in faster warm up (EFE). It would also have the AIR (Air Injector Reactor) system pumping air into the exhaust manifolds and would also have the vapor canister system. There would also be a Vacuum Control Switch on the thermostat outlet to control vacuum advance to the distributor. NO EGR or CONVERTER (but I think all that other stuff was more than enough!) The Emission Control Sticker mentioned above would have been attached to the air cleaner on Heavy Duty Emissions vehicles (over 8,500 GVW) - without the original air cleaner, you will have to search to find one of those stickers that will not only show the Emission Controls, but also the vacuum routing and tune-up specs.