How bad did I #$&% my piston up?

70Duster440 said

Take your current bore size and multiply that number by the ring end gap factor they specify. In this case, for a NA engine the factor is .0065. If your current bore were 4.030", the top ring gap would need to be .026"

http://www.kb-silvolite.com/kb_car/clearance_pop.php

Click to expand...

Alright...so how exactly does the piston to wall clearance come into effect and what do I need to do regarding that? I apologize if I seem daft on this subject. Or is that something that the machine shop should have taken care of when they had the block/pistons?

So I WILL need to use a file to file down the edges a little bit and just keep doing a trial and error fit until I hit .0026" right?