changing header to application/javascript causes blank lines

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Greetings!

When I create a single page and add a header() to change the content type to application/javascript for some jsonp stuff I'm doing, I get 5 blank lines. The dom inspector for chrome is populating some basic html and a user agent stylesheet for the pre tag. Wget and curl just gives me the five blank lines. This doesn't happen when changing the header to javascript in a non-concrete context. Does anyone know where the blank lines originate? I've poked around int he code base a bit, but nothing jumps out at me.

Nirgali