What is the with size of the exhaust bolts.

[Boriqua935]

I want to try to fix stripped head thread where the exhaust bolt goes in with heli-coil. What size heli-coil do I need?

 

[chevy1]

They're m5=metric 5 and the lenght depends on what pipe you run.

 

[Boriqua935]

Anyone know chain store who sell thread repair? Heli coil in m5. Smallest I can find is m6