There is an article on Tim's 914 Fan Page
http://www.914fan.net .
You have to remove the rocker arms and the retaining wire. I suggest setting the cylinder to TDC, otherwise you won't be able to torque the rocker shaft retaining nuts accurately.
--DD
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Pelican Parts 914 Tech Support
A few pics of my car:
http://www.pelicanparts.com/gallery/Dave_Darling