Bummed out

For all intents and purposes you cannot bore the 5.7L block from 3.920" to 4.055" (Some claim that about 1/1000 blocks can be bored that much, but the chances of your block allowing that amount of overbore are well, 1/1000.)

The most common sizes of aftermarket pistons are standard bore and .020 over.

Here's Wisco's list of 5.7 Pistons:

http://www.wiseco.com/PDFs/Wiseco-Chrysler-Hemi-Pistons.pdf

Here's both:

http://www.wiseco.com/Catalogs/Automotive/Chrysler.pdf

Note: I am not endorsing wiseco pistons, I am simply trying to show you what is available.

Regards,

Joe Dokes