Can these be installed without removing the head from the block?

Are they designed so they can be re-used, wherehas oem are known to stretch ? (H22A engine)

thanks.

 

You must remove the head. They can be reused. I dont know if there is a limit to how many times I think I have reused mine 3 or 4 times now.

 

Many people including myself have installed the studs by just replacing them one at a time. Obviously its not the recommended way to do this but it does work good from my experience

All the times I have done it the person had been previously warned and knew the risk...

 

and by one at a time you mean with the head still installed .. ?