How much power can the original crankshaft handle?

 

I'm assuming you're talking about a B20 from a CRV as opposed to a Prelude? The B20 cranks from the CRV's are pretty much like most of the rest of the B series cranks: indestructable (unless of course you do something stupid).

 

I'm not planning to do something stupid and yes it's a b20z crank.