dunked dc

I bought this ej6 with a poorman type r swap in it, and its bored out, im putting in new pistons but i need to know what size to get? whats the easiest way to figure this out?

AutoXer

You can get one of these cheap:

dunked dc

ok just went and bought one and my block is bored to 81.50mm so do i get 81.5mm pistons?

habib

yes

LS-turboner

ideally you match the bore size to an individual piston, i.e. measuring a specific piston and boring/honing the cylinder to that piston size, since they are all slightly different in size. you do this to get the piston to wall clearance perfect.
not the other way around, matching pistons to an already bored and honed block is not ideal at all. the P2W clearance will vary from what is reccomended.

LS-turboner

if you're dropping cash on internals and want it to last, might as well go 82mm and get fresh bore/hone, that way they can bore your block to spec with the pistons in hand