If you did the Coke/Pepsi test: 848 head vs. 913 head in no way would you be able to tell the difference in performance. You would have to have Hotrod Lincoln's experience to tell the visual difference (outside of the obvious number designation).
So Jerry what is the difference between a 848 head and
a 913 head?
Is the 913 head good as the 848 to improve performance?
Jeffrey
