here a links i found on porting there is a lots of picture,and a little bit of how-to,from my experiance,you should never attempt to port your engine but if you want to give-it a try here some pics ,and by my experiance this is some verry nice porting pics so enjoys!!!I:II:I
http://rides.webshots.com/album/240071089YNhjzU
http://rides.webshots.com/album/240071089YNhjzU