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Build serious power with this 427" LS Short Block, available in three performance configurations to match your horsepower goals. Assembled with tight tolerances and premium components, each package is tailored for street, strip, or full drag duty. Choose your desired output and piston volume, and let this short block become the foundation of your LS performance build. Need help picking the right cam? Call 210-446-0960 for expert recommendations!
Explore the components in each configuration:
| Horsepower | 427" LS Short Block Details |
|---|---|
| 1300hp |
Block: Dart SHP Iron, 7/16" Head Threads, 7/16" Main Bolts, 4.125" Bore Crankshaft: 4340 8-Counterweight, Internal Balance, 4.000" Stroke, 58x Rods: 4340 Forged Steel Power-Adder H-Beam w/ ARP2000 Bolts, 6.125" Length Pistons: Wiseco 2618 Forged Aluminum, Coated Skirts, 0.200" Pins Rings: Stainless Steel Top, Napier 2nd, Low Tension Oil |
| 1700hp |
Block: Dart SHP PRO Iron, 1/2" Head Threads, 7/16" ARP Main Studs, 4.125" Bore Crankshaft: 4340 8-Counterweight, Internal Balance, 4.000" Stroke, 58x Rods: 300m Billet Steel Power-Adder I-Beam w/ ARP2000 Bolts, 6.125" Length Pistons: JE Ultra 2618 Forged Aluminum, Coated Skirts, Gold Thermal Barrier, 0.200" Pins Rings: Stainless Steel Top, Napier 2nd, Standard Tension Oil |
Included Kits:
- Camshaft Kit: Forged Camshaft, Gaterman Link-Bar Hydraulic Roller Lifters, 4x Timing Set (pre-installed)
- Sealed-Up Kit: Melling 10295 Oil Pump, GM Rear Main Seal Cover, Gen IV Front Timing Cover, LS Valley Cover, Turbo Oil Pan (pre-installed)
Build Tip: The 1300hp setup is a killer choice for LS3 street builds or single-turbo strip cars. The 1700hp configuration is ready for serious boost and track duty—pair with high-flow heads and a dialed tune for max output.
Installation Notes: Bearing clearances and ring gaps are pre-set, but a qualified engine builder should complete final assembly and tuning. We are not liable for damage caused by improper installation or mismatched parts.
Sales Policy: Short blocks are custom-assembled and non-returnable. All sales are final—please confirm your engine specs before ordering.