Porsche dual overhead cam motor?
 

back in the 1950's porsche made a dual overhead cam motor out of a relatively standard 1600cc type 1 style motor. i was curious if anyone knew of where i could see detailed prints of the entire valve-train, cams, and shafts that led to them, i'd also like to see how they worked out the dual distributor system. i've seen a few cutaway pictures on the internet, but i'd like to see more of how they made it work and how they arranged the heads.

any links would be much appreciated! thanks！ VCDS 15.7