I've found out that the 2003 to 2008 engines had 9.6 compression.
The stock stroke is the same as a 360....3.58 inches. A longer stroke can push the CID to 392-400+ inches.
I've looked at rotating assemblies. Some list some oddly low compression ratios. I wonder if these are for people that intend to run a supercharger?
More cubes would allow me to retain the axle gearing as is.
I do not want to give up reliability and durability just to gain power. I know that as the stroke gets longer, the piston sometimes gets shorter. I don't want hockey pucks for pistons that wear out the rings in 40,000 miles. I'm at 358,000 with this stock engine. If long term durability is an issue with an increase in stroke then I'm sticking with what lasts.