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I believe is means "IMproved COmbustion". Usually had a belt-driven air pump that put air in the exhaust manifold to allow continued combustion in the exhaust and reduce emissions.
 

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I believe is means "IMproved COmbustion". Usually had a belt-driven air pump that put air in the exhaust manifold to allow continued combustion in the exhaust and reduce emissions.
Nope. You're describing the Thermactor system with its belt-driven pump.
IMCO deals with specific lean carburetor settings and revised timing via the vacuum canister, etc. That's the V8 setup at least.
 

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Yep. Basically the IMCO system was very careful matching and tuning of such components as the carburetor and distributor.
 

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Per the shop manual (page 8-34 if anyone is interested):
IMCO
The IMCO exhaust emission con-
trol system controls engine combus
tion at a level to reduce contam
inants normally emitted through the
exhaust system. This is achieved by
using a specially-calibrated carbure
tor and distributor in conjunction with
revised valve timing events.
 
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