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For Sale: 427 ci Dart LS Next Short Block w Darton Sleeves

Callies Billet Crank, Dyers Top Billet Rods



1545 Mound Road, JOLIET, IL View Map


BOROWSKI RACE ENGINES, INC. has established its position as the leading builder of Dart LS Next engines by being first in line with pre-production orders, working cooperatively with other top vendors to create custom solutions, building a wide range of extreme engines and maintaining inventory of key components. As a result of our effort, experience and investment, we can now offer world-class LS assemblies and engines on SHORT LEAD TIMES. Our standard LS Next displacement is 427 cubic inches. The blocks we inventory are the Gen 1 Dart LS Next iron, aluminum, aluminum with Darton-MID wet-sleeves and the new skirted iron SHP. The short block in this ad is a poster child for what our high-end LS builds are all about.

This extreme short-block features:
- Dart LS Next aluminum block with Darton MID wet sleeves and ½” head bolts
- Callies custom Ultra-Billet crank
- Dyers billet rods with ARP 3.5 rods bolts
- Custom Diamond pistons with hard anodizing, wear and thermal barrier coatings

This piece is intended as a platform for builds of 1,500 horsepower and more. That means moving from forged to billet parts for the crank and rods. The tremendous heat generated at this power level requires additional protection for the pistons. Here, we have upgraded our pistons with hard anodizing and coatings to better handle the extreme environment. This short block also has piston oilers to remove more heat than what is possible through just the cylinder wall.

The Darton MID wet-sleeves allow the LS Next aluminum block to perform at a whole new level. The sleeves improve cooling helping the pistons and preventing premature detonation. The head bolts going to the base of the sleeves place the entire engine under compression thereby reducing the tendency for the heads to separate from the block. The net result is greatly added mechanical strength and better heat transfer.

The custom LS rotating design we developed with Callies and Diamond puts maximum strength at the weakest point, the piston. The shorter rod length we use leaves room for a longer piston. The longer sleeves in the Dart LS Next block provide support throughout the stroke. These custom pistons carry a BOR part number and feature:
- Thick crown with softened edges to prevent detonation
- Better ring spacing to prevent the ring lands from collapsing under boost (about 30% wider spacing than shelf pistons)
- Lateral bracing for better side support
- 0.205” wall wrist pin
- Double wrist pin oilers and banana groove
- CNC lightening on the underside

Dyer’s Top billet rods were selected for their extensive history of performance under race conditions. The crank is upgraded to Callies’ best – the Ultra Billet. Holding them together are ARP 3.5 rod bolts with 260,000 psi tensile strength.

We still need to finish machine and assemble all these great components. Our 4-axis CNC mill boasts precision of 0.0002” and 0.001 degree allowing us to achieve virtual perfection. Our computer balancer is comparably amazing in its resolution. Where we remain old-school is with our hones. We prefer stones over the modern diamond cutters, as we feel the finish is superior for seating rings. The people who are machining or assembling your block are skilled professionals with years of experience.

Available Options and Upgrades
- Block: full billet LS Next aluminum block
- Pistons: ceramic crown for heat shielding
- Custom wet sump oil pan
- Daley Engineering dry sump with billet pan

Short Block Part Numbers
BRE045987 - LS7 flat top
BRE045988 – LS7 dish
BRE045989 – LS3 flat top
BRE045990 – LS3 dish
Upgrades: piston oilers, treated pistons, ARP3.5 rod bolts

Whatever your needs in the world of LS engines, please call us at 815-725-2727. We’ll be pleased to help you select the best possible piece to meet your performance requirements and budget. And don’t forget about the short lead times.


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Ad #182689804
Expires on: 10/22/2016
Posted: 10/15/2016
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Ad posted by:
BorowskiRace (#327877)

Borowski Race Engines, Inc.
1545 Mound Rd
Rockdale, IL 60436
(815) 725-2727

Member Since: 10/23/2008
Phone Number: 815-725-2727

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Toll Free: 866.326.9227 • Tel: 413.663.3496 • Fax: 413.663.3615 • Email:

Execution Stats: 0.200 sec / 8.2 MB used / 8.3 MB peak