Piston Sizing

[mark4g63t]

I'm pretty sure I know the answer but just want to be sure before ordering pistons and having to exchange them.
I'm building a 6 bolt block and I'm using an I beam rod that uses a 22mm wrist pin. Do I use a 7 bolt piston or a 6 bolt piston? Is the only difference the pin size between the 6 bolt and 7 bolt? Right now I believe I need a 7 bolt piston to achieve the 22mm pin diameter.
Thanks

[Goat Blower]

You simply order aftermarket pistons with a 22mm wrist pin and the right overbore, 1g or 2g doesn't matter, even the stock pistons have the same pin size from 1G to 2g, although I believe it's 20mm or 21mm.

[mark4g63t]

7 bolts use a 22mm pin and 6 bolts use a 21mm pin. I've only seen one or two of the 6 bolt pistons with the larger pin.