31837211 Dart LS Next Block, 9.240" Deck Height, 4.125 Bore

Dart’s LS Next block is the first significant change in the 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 along with a much stronger main web area.
The conventional LS and LT oiling systems is a multitude of errors. This results in an oiling system that has and will continue to cause failures. Dart has used a proven simplified oil system that consumes 10 less gallons per minute (GPM) at 5000 RPM’s.
Dart’s LS Next block is cast in the USA with premium cast iron alloy.
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 .375” at the bottom, providing greater piston support for all combinations
9.240” – 9.450” deck heights are available which allows for a possible effective barrel length of 9.825” deck block.
Extra thick Siamese cylinder bores allow for large displacement capacity, and a max bore size of at least 4.200”.
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.