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 features:
- Dart LS Next customized aluminum block (1/2” head bolts, full round outboard sleeves)
- Callies custom 6 inch Ultra rods and Magnum crank
- Diamond custom pistons
This piece is intended as a platform for builds of 1,000 horsepower and more. Besides achieving the desired level of performance, it is built to survive. Everything must be verified – design, raw materials, manufacturing processes, quality control procedures. In this power range, you can’t cut corners without getting bit. When it comes together however, it is a thing of beauty. The LS7 in the video using this short block combines a 4.5L Whipple supercharger, nitrous spray bars and water-methanol injection to produce 1,429 horsepower on race fuel and 1,123 horsepower on pump gas with water-meth spray.
Dart had done its homework on the LS Next block design. It features:
- Premium cast iron alloy Cast in the USA
- Conventional style 4-bolt steel main caps with 7/16” bolts
- Full main webbing for maximum bottom end strength
- Cylinder barrels are extended by .3750” at the bottom
- Extra thick Siamese cylinder bores
- A 5/8” thick full deck design with a 9.240” deck height
- Six head bolts per cylinder
- 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
We tuned it further by upgrading from 7/16th” to ½” head bolts. According to ARP, this increases the clamping power by 50%. We also upgraded to half Siamese sleeves on the outboard cylinders to eliminate a small crescent shaped gap that would otherwise exist.
The rotating assembly 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
With the race-proven Callies Magnum crank and Ultra H-Beam rods, we didn’t need to worry there. Callies uses extremely clean Timken alloy formulated to their specifications. The rod fasteners use 260,000 psi tensile strength steel. The Magnum crank is an upgrade with additional performance-enhancing machining to their legendary Dragonslayer crank.
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. No “Hecho en Mexico” by $2/hr laborers like a lot of the crate engines on the market now.
Available Options and Upgrades
- Block: LS Next aluminum block with Darton-MID wet-sleeves or a full billet aluminum block
- Crank: Callies Ultra billet
- Rods: Dyers billet
- Pistons: hard anodizing, Moly coated skirts, ceramic crown for heat shielding
- Piston oilers
- Custom wet sump oil pan
- Daley Engineering dry sump with billet pan
Short Block Part Numbers
BRE045832: LS7 BOR800 flat-top piston
BRE045833: LS7 BOR800 dish piston
BRE045834: LS3 BOR801 flat-top piston
BRE045835: LS3 BOR801 dish piston
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.