587 HP pump gas 360

Moper right about that 4 inch arm. In lower power builds, it's all torque. If you decide to go for some serious power, like @ 1.8 HP per cube, the pay off starts to come around.
The smaller the engine and/or the high the RPM's the engine sees (short stroke and or higher RPM's) the higher the stress there is on the engine.

This is where builds become expensive.