Dart Aluminum LS Next Block - $5,206


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Business Seller - Borowski Race Engines, Inc.
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Borowski Race Engines, Inc. is a leading builder of LS Next engines, having been at the front of the line for all Darts new product releases back to the original LS Next iron block, and up to their latest LS Next2 block. We used them as platforms for LS engines with power adders including Whipple superchargers, nitrous oxides and twin turbos rated to well over 2,000 hp. In the aluminum variants, we have completed builds using the original Gen 1 skirtless, the new skirted version and Darton MID wet-sleeved for extreme applications.

We use Dart LS Next blocks exclusively once we get into higher horsepower LS builds. There are a lot of reasons why we believe they are the clear choice, and they are laid out in the Background section of this ad down below. This ad is specifically for the aluminum blocks which are considerable more expensive than their iron counterparts. Who buys these? People using power adders for whom taking out 100 lbs. is a big deal. Applications include: autocross, fan boats and road racing. For drag racing, most people stick with the iron blocks and look to offset the extra weight with additional horsepower from some other source (ex. higher boost).

There are a wide range of LS Next aluminum block options from Dart such as skirts, raised cam, tall deck, 0.5 inch head bolts and Darton MID wet-sleeved. We can supply blocks with any combination of these options, and either as-produced by Dart, or fully machined and assembly-ready (see Description below). Already have heads, but want 0.5" bolts? Send us the heads and we will ream them for you. Want piston oilers? Let us know and we will install them for you.

A recent addition to the option list is the LS Next2, which targets builds over 1,000 hp. This features Ford Cleveland-style mains with half inch main studs and an available 2.750 inch main which we would invariably pair with 0.5 inch head studs.

If you’d like, we can take your project further. From short block to long block to fully dressed crate engine with whatever type of power adder you want - and whatever horsepower you want. We carry inventory of the high-end parts we need for these big-power builds and can supply them to you as parts, not just as completed engines or assemblies.

Call and ask for Ken at 815-725-2727 to discuss your specific needs.

Description for Fully Machined, Assembly Ready (Cost $500)
- Square deck to height on 4-Axis Rottler CNC
- Deburr entire block and main caps
- Hone cylinders with torque plate
- Alignhone mains, hone lifter bores
- CNC chamfer cylinder bores
- Final clean block and paint with primer
- Install Dart cam bearings and test fit cam
- Install oil galley and freeze plugs

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 engines 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 without the GM-style bay to bay breathing windows. Deleting these windows also allows the cylinder barrels to be extended by 0.3750 inch 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 inches. The maximum bore size is 4.165 inches for the dry sleeved blocks (standard), or up to a 4.220 inch bore with the optional Darton M.I.D. wet-sleeve kit.

Blocks are available with either unskirted (standard) or skirted (optional) designs. The unskirted variant allows you to utilize all stock and aftermarket LS components. For the $103 upcharge, we think it is well worth the money given the savings on oil pans and accessories.

Conventional style 4-bolt steel main caps are used. A 5/8 inch thick deck design is utilized for superior strength, with six head bolts per cylinder to provide secure clamping. Darts priority main oiling system ensures high rpm reliability and includes provision for oil restrictors in the lifter valley.

- Darts LS Next blocks are cast in the USA with premium aluminum alloy
- Conventional style 4-bolt steel main caps with 7/16 inch bolts are standard
- Full main webbing for maximum bottom end strength
- Cylinder barrels are extended by .3750 inch at the bottom, providing greater piston support for all combinations
- Six head bolts per cylinder provide secure clamping for power
- 9.240 and 9.450 inch deck heights are available. The optional 9.450 inch tall-deck allows for a possible effective barrel length of 9.825 inches
- Blind head bolt holes do not 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
- Dual starter mounts
- The water jacket on the #1 cylinder has been expanded for additional cooling capacity
- LSX style lifter bosses and dog bone provisions

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Borowski Race Engines, Inc.
Member Since October 2008
1545 Mound Rd
Joliet, IL 60436
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