Stronger Crank? - Stock Forged 3.31” vs. Aftermarket Cast New 4”

Wow some great responses!

Seems the stock forged would be stronger, assuming when I pull and inspect it there are no issues.

However when it comes to price, seems the cost of turning the mains, polishing, and balancing my old crank would be about as much as a new cast crank and selling the forged unit... Oh hell I dont know.

Then there is the RPM issue. I had planned a stock stroke build with lighter slugs and rods, with a solid lift cam, beehive springs, ignition, ect. I was planning to have the ability of spinning the assembly up to 7k when needed.

What about weight? Isnt the forged stock crank heavier than the cast? How much of a weight savings / performance gain would there be?