I'am cleaning up my n42 head, smoothing out the casting marks in the runners and the valve bowl.

Has any one else done their own porting?

any tips would be great...

and any pics would be ecen better!

best left to a pro. if you have never have done it before. If not done correctly you will change the cc volume of combustion chambers and cause an unballance situation . As well as disrupt the flow of the intake chambers by getting them to smooth. I have a friend that builds race engines and specializes in head work and that is what he told me . Just passing on some info.