The 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 utilizing conventional style main caps and oil pans. Dart has addressed the problems resulting from the LS engine’s separated crankcase bays. Windage is greatly reduced, resulting in increased power and improved lubrication. This design change led to several additional improvements. The main webs are significantly stronger because the bay to bay breathing windows are eliminated in Dart’s design. Deleting the windows also allows the cylinder barrels to be extended by .3750” into the crank case, providing greater piston support at the bottom of the stroke. Two standard bore sizes are available, 4.000” and 4.125”. Maximum bore of 4.220” for iron and 4.165” for aluminum. All stock and aftermarket LS components can be utilized. Conventional style 4-bolt steel main caps are used. A 5/8” thick full deck design is utilized for superior strength, with six head bolts per cylinder to provide secure clamping. Dart’s priority main oiling system ensures high rpm reliability and includes provision for oil restrictors in the lifter valley. Dart’s LS Next block is cast in the USA with premium cast iron alloy or aluminum Conventional style 4-bolt steel main caps with 7/16” bolts are used Full main webbing for maximum bottom end strength Cylinder barrels are extended by .3750” at the bottom, providing greater piston support for all combinations 9.240” deck height, with options of 9.450" are available which allows for a possible effective barrel length of 9.825” deck block Extra thick Siamese cylinder bores allow for larger displacement capacity and a max bore size of at least 4.220” A 5/8” thick full deck design with a 9.240” deck height Six head bolts per cylinder provide secure clamping for power adder applications Head bolts are upgraded to 7/16” for increased strength Blind head bolt holes don’t go through into the water jacket Provision for oil restrictors in the lifter valley Revised low restriction priority main oiling system Pro-Stock / Pro-Mod big block style stepped main oil galley An external oil filter must be used with stock or aftermarket oil pumps Dual starter mounts The water jacket on the #1 cylinder has been expanded for additional cooling capacity LSX style lifter bosses and dog bone provision are provided We offer custom versions of these blocks featuring 1/2" head studs, custom sleeves and piston squirters. Click here for more information.
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