I've been researching head porting, bowl blending, etc for the engine I'm working on. In several threads here and at Mnet I have seen reference to a DIY article by SA. The SA links are all broken. I just stumbled on the article posted elsewhere.

Lots of good information for people wanting to do a DIY porting job. Not miata specific but good info and clear instructions. Hope it's of help to others like myself looking to clean up our heads.

head porting diy by standard abrasives