Destroked

I read a post by Gordon Levy talking about destroking a NASCAR 358 or just a 351W and spinning it to 9,000rpm avec beaucoup de hp.

Why destroke? What are the advantages? Would you destroke a motor for street use?

So much talk about stroking motors but never the opposite.

How would you destroke it?

The advantages would be to get it to rev higher. Since HP = torque(lb-ft) * RPM / 5252, you would get more horsepower as a result of running higher RPMs.

Here is what appears to be an interesting link that talks about torque vs. horsepower (I only skimmed it).

As to how, the crankshaft determines the stroke. You'd have to use a shoter-throw crankshaft and longer rods. And then you would probably have to worry about your compression ratio, since the shorter stroke would reduce the CR. So you'd definitely need different heads. Smaller combustion chambers, but you also need more flow at higher RPMs...