Originally Posted by kewpie79
I do know there are 9/16 cranks, did a search on here to learn all about them.
That's it? That's all that you have to add?
Using "9/16" is an antiquated way of describing a stroker crank size. I know the term is still in use, but if you want to talk stroker cranks- especially SBC stroker cranks (and not early Hemi or flathead Ford, etc.)- you might want to use the more common decimal/fractional measurements, i.e. 3.48" stroke is stock 350/305/267 crank size, 3.75 (or 3-3/4" if you prefer) is the stroke of a 400 SBC and is by FAR the most common size stroker crank to use in a 4" bore SBC block (327/350), but you'll be hard pressed to find anyone using "3/4 stroker" when describing it.
Unless you're trying to fit into an oddball class displacement rule or trying to cheat, there's little point in not using as much stroke as can be used w/o needing to jump through too many hoops (like is required to use a 4" stroke in a SBC, for instance). That means a 3.75" stroke. Which is (as I've already said) what's needed to get 334 cid out of a 305 block. The same crank w/different pistons will get you 383 cid from a 4.030" bore SBC.