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Removal of the extension does not effect the operation of the heater control valve.
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Just so you know -
That extension tube purpose is to draw coolant from the bottom of the intake coolant crossover. It allows for less air bubble pickup which may air-lock the heater core.
There is an aftermarket high flow WP impeller/shaft that will allow the retention of the numbers correct WP casting if it is numbers correct car.
Think twice before removing the heat riser valve depending on where you live.
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"Last Sunday, I caught him makin' eyes at Idell Bushey durin' preachin'. And I know what they do up there in the hills when they say they're possum huntin'. They're just sittin' around the campfire, drinkin' hard cider, hittin' each other on the shoulder and hollerin' 'flinch!'."
― Charlene Darling (Daughter of Briscoe Darling)