Head
Doug Dutra on modifying the combustion chamber:
http://www.slantsix.org/articles/combustion-chamber/sl6-combustion-chamber.htm
Doug Dutra article on porting the Slant 6 head:
http://www.slantsix.org/forum/viewtopic.php?t=41693
This post has a chart showing flow-bench numbers for the head with 9 steps from stock to fully ported:
http://speedtalk.com/forum/viewtopic.php?f=1&t=22094
as mentioned in the 'too bad you're so far' reply, shave the head and go to 1.70/1.44 valves
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