i know the stock flow is 30mm and exhaust is 26mm, what is a good size for port and polish. thanks

 

bump

 

what does that mean? how do you measure a port and polish?

 

well i'm not to familiar with how you go about doing it. but my buddy is going to do it for me and he figures an extra 3mm would be safe on the exhaust side. do you have any experience, if so some knowledge would help. thanks, sorry for the noob question.

 

has your buddy done this before with good results? 3mm in the wrong place could scrap the head..

if you're buddy can guarantee his work and ensure that it will make more power afterwards, sure let him at it. but my guess is that if you're asking questions like this, he also may not know much about it otherwise you would just ask him.

since i don't know your buddy, the only fair recommendation i can give is that you take it to a professional with a good reputation and honda/import experience.