Originally Posted by ed7r
I have a sirio evo3 3 port non STI that's in need of a new p/cyl. Can I put a 5port sleeve in it? I've been told that an STI sleeve would fit but a 5 port slv. cost $90 on kyoshos site versus $150 for a STI slv. on murnans site. Any info would greatly be appreciated. Thanks
The 5 poet sleeve will fit in the 3 port case but i believe that the crank is also different to the 3 port item with more aggressive timing!
To get the full 5 port performance you will need to aquire the matching crankshalft!
The STI sleeve will give your motor as good performance as the 5 port sleeve imho!