The journey for Porsche to LeMans glory starting in 1970 is almost a textbook case of incremental evolution. A new trait here works, so it sticks. A few things lost in the name of ultimate high-speed glory. 
Seeing the 1966 Porsche 906 Carrera 6 beside a close descendent, the 1968 908K, makes clear how carefully Porsche was refining its alloy spaceframe racecar during the 1960s. They really knew they were on to something with the ultra-low boxer engine masses, mounted right behind the driver for optimal handling. The 2.0-liter six of this racecar shares much of its fundamental design with the 911, and would ultimately enhance the 911 range with its extra power.
1966 Porsche 906 Carrera 6
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
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Tom Burkart is the founder and managing editor of Car-Revs-Daily.com, an innovative and rapidly-expanding automotive news magazine.
He holds a Journalism JBA degree from the University of Wisconsin – Madison. Tom currently resides in Charleston, South Carolina with his two amazing dogs, Drake and Tank.
Mr. Burkart is available for all questions and concerns by email Tom(at)car-revs-daily.com.