Ive contemplated the possibilities and decided it is just best to buy a good used 6.4 block and used pistons before boring a 5.7 block unless you had a brand new block that didn't need bored but you would still need custom pistons that cost as much as a good used 6.4 block. The 6.4 blocks have gotten a lot cheaper lately.
Thanks for the input Dave. Everything G3 hemi around here is still crazy expensive, guys still want 2k for early 5.7 cores although some pop up for $500-$800 from time to time. Anything 6.1 or 6.4 is crazy money still, but someone local was selling a 6.4 rotating assembly and I thought maybe the crank and rods could work with a custom or off the shelf piston. Just wasn't sure who was doing it. I figured the 6.4 pistons would be a no go just on the bore size alone.
