I'm building my own templates and porting my 6 port NA, I just want some feedback on the portsize/shape of the templates before I go to town. How much area is necessary to support the corner seal? Should I avoid porting in that direction?



Any feedback is greatly appreciated!

 

Your primary port looks weird. I would close it at 74 spec. Not sure if I'd change the opening timing.

As for the secondaries, there is already a lot of port area there - really late closing as stock. Maybe open them slightly sooner than stock.

 

so keep closing time for the secondaries stock but open them slightly sooner? How much area is there to port between the oil control ring running area to the corner seals? should i avoid any porting in those directions?
Thanks!

 

They are cheap to buy from professional shops that have spent a lot of time and money on R&D so why risk using your own template?