Dart’s LS Next block is the first significant change in the bottom-end architecture of the LS engine platform. By eliminating the “Y-block” design and replacing it with conventional-style main caps and oil pan, Dart has addressed the problems resulting from the LS engine’s separated crankcase bays. Opening up the main cap area accomplishes several things. Windage is greatly reduced, resulting in greater power and improved lubrication. The main webs are stronger because the breathing windows are not required in Dart’s design. This also allows the cylinder barrels to be extended by 0.375-inch at the bottom, providing greater piston support with long stroke combinations. Aside from the oil pan, most stock and aftermarket LS components can be utilized. Conventional style four-bolt ductile iron or steel main caps are used, a 5/8-inch thick full deck design is utilized for superior strength and versatility, and six head bolts per cylinder provide secure clamping for poweradder applications. A priority main oiling system ensures high-rpm reliability and includes provision for oil restrictors in the lifter valley.
Dart spent a significant amount of time engineering the new block and the net result is a true blending of old-school reliability with a new-school technology for big performance.
Dart’s LS Next block blends old and new school technology for big performance
||Gray Iron 220 BHN, optional CGI up to 270 BHN
||Increased 0.375-inch over stock length
||4.000- or 4.125-inches—can be safely bored to 4.200-inches
||Std.—options up to 60mm babbitt or 55mm roller
|Main Bearing Size
||Std. LS: Revised top shell
||Four-Bolt, Ductile iron or steel—splayed bolts on Nos. 2, 3, and 4
|Rear Main Seal
||Stock 0.842-inch—other options to 0.937 keyed
||True priority main—wet or dry sump