426 stroker kit

Cuda srt8- the 440 uses a 4.25" stroke.
All ~426 builds use either a 4.05-4.08 stroke.
I have yet to see a 4.00" stroke. I think Andy offers one but I don't think it's a shelf item anywhere else.
Scat recently released a 3.90" stroke.

Options:
3.58
3.795- iron '392' using 6.1
3.900
4.05 - iron '426', iron 392 using 5.7
4.08 - iron '426', iron 392 using 5.7
4.125- not a regular shelf item- used in alum blocks mostly- aluminum block '440'
4.25 - (iron '440' crank)

In iron blocks:
The 4.25" stroke cranks are not used with boost. The 4.05-4.08 are, and are the most commonly used stroker cranks for those under 1000 rwhp. Lots of cars run the 4.05-4.08 with good longevity, including joelvan who road races his challenger in american iron series. For big boost and longevity, the 3.795 or 3.58 is used. The compression height of the pistons puts the pin into the third ring on the 4.05" and up cranks.

The 4.05/4.08" are considered 4" stroke cranks.



Everything I have read indicates the main concern with the longer strokes is crank strength (overlap), main strength, and piston deck height. Few discussions on 'scuffing' of pistons, mostly related to 4.25" stroke iron block 440's.

Emil's link to Andy's post is much more in detail.