426 stroker, is it reliable?

Great question, Scrappydoo! Glad to see a line being drawn between race engine and street engine parameters. If a 4" stroke is too much for longevity, so be it. People are successfully racing them and doing well, which is good. Not all of the things that are learned through racing, however, translate to useful on the street. That's OK, too.

FWIW: Mopar Performance forged and billet cranks maxed out at 3.79 stroke. They made a 4" cast crank for the 340 & 360 journal sizes. Mopar also had forged pistons for up to 3.79" stroke for the small block. Don't know if they are still available or price.

Food for thought: A 4.06 x 3.79 bore & stroke = 392 CID.
------------------- 4.10 x 3.79 = 400 CID