[RodKnock]

The Pond is an exact duplicate of the 427 side-oiler down to the date stamp and the CSX block is not. The CSX block has cross-bolted mains on main caps 2, 3 and 4. The CSX block is approximately 15-20 lbs heavier and the claim is that it's good up to 1,500 HP and has a priority main oiling system.

To the best of my knowledge, there are no direct performance comparisons available to the consumer.