I have search but found nothing on HT. How far should the groove be from the cylinder bore?

 

That's because it's not a DIY job nor a job for any shop that doesn't do them on a regular basis. And it will vary.

 

Ok..so it vary depending on size of the bore? Im buying the isky groove o matic, so need some tips or recommendation on how far they should be. Its for b series block with 86mm bore. Never had pistons over 85.5mm and I heard about issue of leaking with 86mm or larger. Any info will be useful.