should you re-thread a head

[510mango]

The P.O of the car stripped the threads on the cylinder heads last piston on the intake. My question is should a pro fix this, can I fix this without taking the head off just the intake and header is it difficult (wheres a good place to buy metric size tap sets), or should I look for a new head. This is something that I should have done like a year ago but never got around to it but I figure I should ask before I try to break/fix something.

[okayfine]

The P.O of the car stripped the threads on the cylinder heads last piston on the intake.

This is unclear to me.

If the threads are gone, there's nothing for you to tap with the OE thread size. Helacoil (or the like, there are some brands people like better) is the next step.

[heirfaus]

Yep sounds like helicoil is the next step. If you are not experienced with helicoil and aren't removing the head it may be a challenge. You want to drill and tap it as straight as possible. Maybe better left to a professional, but I'd do it myself...wait I am a proffessional , but if I wasn't I'd do it myself anyway.

[datzenmike]

Drill out and go to the next oversize stud.

The last piston on the intake would be the lower... stud ... right? It clamps the intake and the exhaust manifold.