Eagle 4.25" stroker crank

An acquaintance of mine ran a 471" sbm for several years. No durability problems that I know of. Nine second street driven 71 demon. The one pass heads up against him, I got to the finish line first..... but I had to redlight to do it, lol .
His 501 (or was it 502?) sbm didn't last. Too many too-light components.
The bigger the small block you build the bigger/better heads you need.
Don't put a 225cfm head on a 440 inch motor like Mopar did.