This 427ci LS short block set is intended for big power builds. The Compression Ratio is a boost-friendly 9.75:1 when paired with a 68cc combustion chamber. Check out this parts list:
- Dart SHP Pro Block
- Callies' Fully Counterweighted (CCW) Magnum Crankshaft
- Calico Coated Rod and Main Bearings
- Callies Ultra Enforcer or Dyer's NH Series Double Banded Forged Connecting Rods depending upon availability
- Diamond 2K Pistons
- .225 Wall Wrist Pin
- 12 Degree (LS7) Valve Reliefs
- -20cc Dish
The Dart LS Next SHP Pro is the newest in Dart's line of LS Next engines blocks. The difference between the "Pro" and the SHP LS Next block are the metallurgy and standard main studs instead of bolts. The Pro has a higher nickel content for 30% higher tensile strength so it can handle more power.
SHP Line Features
- Full side skirts to accommodate OE oil pans
- Accepts LS style Oil filters
- Retains all factory bolt hole locations
LS Next Features
Retains all of the LS Next designs features not found in competing blocks including but not limited to:
- Longer cylinder sleeves,
- Priority main oiling
- 4 bolt splayed main saddle structural
This 427 cubic inch short block come from its 4.125" bore and the 4.00" stroke of its Callies' center counterweighted Magnum crank. The center counterweighted Magnum crank has a 4.000" stroke and is made from 4340 Timken alloy. The center counterweights are a major upgrade as they increase the cranks stiffness by about 25% while reducing harmonics. The net result is less stress on the main bearings and longer engine life. Watch the video below to learn more.
We use either Callies Ultra Enforcer or Dyers NH rods depending upon availability.
The Dyers NH H-Beam connecting rods have a unique double-banded cap for an ultimate strength to weight ratio. They are manufactured from 300M steel alloy which is 20% stronger than 4340 steel alloy. The Dyers rods weigh in around 670 grams versus 705 grams for the Callies 4340 alloy I-Beams. The Ultra Enforcers added strength is a result of the additional thickness inn key locations. Both are great rods that can reliably handle the power.
Topping off the rotating assembly are Diamond's Race Series pistons which are machined with their newest and most precise CNCs in Clinton Michigan. Among their features :
- 3D milling on piston crowns for ready to install finish
- Valve pockets designed to work with most aftermarket cylinder heads
- Offset pins for quiet operation
- Moly skirt coating for friction loss and skirt wear protection
- Side gas ports for better ring seal
- 2618 material for High HP-NOS-Boost applications
The skill of the people who finish-machine and assemble your short block is just as important as the parts and design and we've got some of the best around. Further, BOROWSKI RACE ENGINES, INC. boasts state-of-the-art CNC machining equipment which empowers our staff to build the best engines available. This was recognized with our being named Race Engine Builder of the Year by Engine Builder Magazine.
The machining and assembly of your short block is every bit as important as the parts selection. We have state-of-the art CNC equipment and have invested heavily in the associated training for our staff as you can see in this Rottler-produced video:
- 3D milling on piston crowns for ready to install finish
- Valve pockets designed to work with most aftermarket cylinder heads
- Offset pins for quiet operation
- Moly skirt coating for friction loss and skirt wear protection
- Side gas ports for better ring seal
- 2618 material for High HP-NOS-Boost applications
The skill of the people who finish-machine and assemble your short block is just as important as the parts and design and we've got some of the best around. Further, BOROWSKI RACE ENGINES, INC. boasts state-of-the-art CNC machining equipment which empowers our staff to build the best engines available. This was recognized with our being named Race Engine Builder of the Year by Engine Builder Magazine.
The machining and assembly of your short block is every bit as important as the parts selection. We have state-of-the art CNC equipment and have invested heavily in the associated training for our staff as you can see in this Rottler-produced video:
Call 815-725-2727 to discuss your engine requirements or just click to place an order.
