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Registered
Join Date: Dec 2003
Location: Milky Way Galaxy - 3rd Stone
Posts: 871
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You don't modify much of anything.
The cooling flaps on the impeller housing remain open. Plugging them is supposed to interrupt / change the air flow characteristics in the impeller housing.
Next you cap the heater inlet tubes in the engine compartment ... the ones that go into the body. This way you don't get engine compartment fumes in the cabin.
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Ron Meier
Backyard Shadetree Mechanic
1974 914/6 conversion with 2.7L (The Grey Ghost)
1973 Chalon with 2.4T MFI (Schlitzalom)
All my 4 cylinders are gone 
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