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What you are referring to isn't blocking the pre-heat hose; rather, some folks force the flap that switches behind the pre-heat hose and open air in the latter position. If you just blockd the pre-heat hose you'd likely screw your engine completely.
Basically there's a temperature actuated door in the bottom of the airbox. When it's cold outside and in the engine compartment the flap opens the pre-heat hose so that air is sucked in from the pre-heat hose. When it is hot outside or in the engine compartment the flap closes on the pre-heat hose and sucks air from outside. The point is to help the engine warm-up more quickly by providing pre-heated air, and something else I can't remember I think...
Anyway, when the tempperature actuator fails the flap gets stuck in the pre-heat hose open position. This isn't good, since it means taht at running temperature you are sucking EXTREMELY hot air into the AMM, increasing wear considerably, shortening the life of the AMM, and decreasing performance (hot air provides less oxygen than cold air in the same amount of space).
The pre-heat system is really only for really cold climates and never worked effectively in teh first place, so some folks just pin the door with teh flap closed over the pre-heat hose to force all air from the outside.
good luck,
rt
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