Or ever.. the aftermarket seems pretty slow on the uptake with this sort of thing. Check back in 15 to 20 years.

If you want to pay for custom pistons and can source a crankshaft you could do it right now. Just use existing stock or aftermarket LS rods and get the pin height adjusted accordingly

 

the compression also depends on the cam you run (affecting dynamic CR) & how you're planning to drive it.
the stock cam had something near -20° of overlap, but my cam has -1/2°.
i'm running about 10.6:1 in the car at a max of 13psi (PD blower & stock stroke), and it feels peppy & responsive

...but i also don't run WOT a lot or spend a ton of time in the upper RPMs. if i did, i'd've went with something in the mid 9.x:1 range because lower compression means i can cram more air into the cylinder before reaching detonation pressure/temp, and more air:fuel in there means less heat and more power.

 

also consider my engine's loaded a little less than yours, too, because my car's 3300lb vs your 5000-6000lb truck.
that said, there's a guy with a white ECSB driving something like a 12.5:1 LQ9 (obviously a NA build), and he likes it.

 

Ok long story short I got screwed out of a bunch of money didn't get to buy my brand new 383 stoker so I did almost 0 research but here's what I have.. I have a 2002 5.3l lm7 I've ordered a stage 4 rebuild kit w/.625/.625 cam ls1 rockers with upgraded trunion kit .625 lift beehive springs 7.4" Manley pushrods msd coil packs 60 lbs injectors and a power Trax grip pro limited slip posi 4.10 rear end. I want to twin turbo my truck very soon but don't know what size turbos or whether to stay with stock stroke or make the jump to 4"? Any insight would be great.. I'm also upgrading to the 92mm fitech multi port intake with Trans control.. also what size stall do you suggest?

 

I suggest starting a new thread. Make sure you post all the pertinent details, goals for the build, intended use, budget, etc.... Be very honest and you will get great input

 

Thank you.