If serous power output is the goal and keeping it together is also part of the plan, you simply cannot go slummin' in the maincaps. Big strokes, high rpm, and big power and torque brutalize the bottom end. Stock Mopars will walk the maincaps at moderate power levels. These Indy blocks are designed with integrated billet steel maincaps in mind. The cross-bolted caps tie the entire lower structure of the block into a "bridge" which, combined with the massive lower-block bulkheads, provides an anvil-tough structure. Cross bolting eliminates the cantilevered structure of a standard-style cap, and is possible only in a deeply skirted block as in a Mopar Hemi or Wedge.