Dart Iron LS Long Block Big Boost - $16,417

Borowski Race Engines, Inc.

For Sale: Dart Iron LS Long Block Big Boost


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For Sale: Dart Iron LS Long Block Big Boost

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Why the Dart LS Next block?

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, (stock pans can be used with Moroso oil pan spacers) 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 aluminim, or optional Darton M.I.D. sleeve kit allowing up to 4.220” bore.

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

Recent customer that brought in a LS2 for a rebuild: “Seeing them side by side, the Dart block is clearly a better piece - even from a distance.”

Dart LS Next LS7, 10.25:1 Compression Designed for Big Boost on the Street with the Benefit of a Maintenance Free Hydraulic Cam. 975HP @ 12Lbs (Pump Gas), 1,155HP @ 19Lbs (C16).

-Dart LS Next Engine Block
-All-Pro LS7 Cylinder Heads w/ Valves
-Callies Dragonslayer Forged Crankshaft
-Callies Ultra Connecting Rods Rods
-Custom Diamond Forged Pistons with Pin Oilers (Pics) & .200 Thick Upgraded Pins
-Diamond Pro Select AP Steel Piston Rings
-Custom Bullet Hydraulic Cam and Bullet Tie-Bar Hydraulic Lifters
-Custom Smith Brothers Pushrods
-Cometic Head Gaskets
-GM Rockers with Comp Trunnion Kit
-Cloyes Hex-A-Just Timing Set
-Clevite HN Rod and HX Main Bearings

Assembly and Labor Included $16,417 (without Tax)

Borowski Race Enterprises

Custom CNC Engine Builders for Street, Race, Restoration & Marine. Est. 1968.

Our state-of-the-art CNC equipment is the most advanced available in the region. The staff boasts more than 100 years of collective experience and include accomplished racers and crew chiefs. This combination of machinery and experience mean that your engine will have more horsepower and reliability. It also allows us to turn your project around quickly.


The Benefits of a Borowski-Built Engine

1.Custom Made to Your Exact Specifications: With our guidance, you pick the sound, look, power and accessories. We make it happen.

2.Technical Knowledge: We make cutting edge engines for a broad range of motorsports. In season, our staff is at the track and on the water to help keep you ahead of the pack.

3.Machining Capabilities: Our CNC engine machining equipment and shop professionals are second to none. That shows in our build quality, reliability and performance.

4.Quality: Our levels of care and precision go far beyond OEM or standard aftermarket. Machining and assembly of your project is performed only by highly skilled technicians.

5.Predictability: On-time and on-budget

6.Build Time: Thanks to our CNC processes, we can complete machining quickly. We have strong relationships with our key suppliers which helps avoid delay waiting for parts.

7.Transparency: Your entire build is photographed and documented. Progress pictures are uploaded and viewable on our Flickr. You are welcome to visit in person any time and will be invited to attend the video-taped dyno session.

8.Honesty and Integrity as evidenced by our A+ rating and accreditation by Better Business Bureau.

9.Our Warranty

1545 Mound Road
Rockdale, IL 60436


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Item Location: 1545 Mound Road, Rockdale, IL View Map
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Execution Stats: 0.158 sec / 9.0 MB used / 9.5 MB peak