Heavy Duty Duffle Bags What Is The Difference Between A Heavy Duty 427, And A Racing 427?

What is the difference between a heavy duty 427, and a racing 427? - heavy duty duffle bags

I have a heavy Chevy 427, and I wonder what is the difference between serious (as found eg trucks) and the race. I know that the heavy has a higher torque at low speeds, but why? Moreover, it would be useful to include in the body of a rat? No idea what would be useful. If the answer if you have a good constructive to say. They waste no time and other time. Thank you for watching.
Jason --