John wrote
In a boxer, the first thing to change is a slightly hotter cam. Next is =
GOOD
ported heads (big valve heads with stock ports is a waste of $),
John
you cant do much to change the cam or you will need to change over to
carbs the fuel injection will not tolerate much duration and lift alone does little. Mr Lilleys cam has about 8 degrees increased duration and NO increase in lift at the cam  It is after all a stock cam reground to different specs 
 you have not driven my van with a big valve engine it is far from a 
waste of money and you obviously have never had a good look at a waterboxer intake or exhaust port they need minor work  
Check my web site for flow info on the stage three engine 
listing
you just don't know what you are talking about when it comes to big valve waterboxer engines and the power they can make   http://www.Boston.com/engine.html
Bob Donalds
http://www.Bostonengine.com