427" LS7 Short Block

The Smeding 427" LS7 Short Block is offered in two different configurations! Each package is meticulously assembled with the highest attention to detail and precision. Bearing clearance & ring gaps are measured, verified and set for each application's unique demands. Two different piston volumes are available, please select a horsepower rating and then the volume option will appear. We can also assist with selecting the correct camshaft for your build and goals! Call 210-446-0960 for more information.

1300hp:
Block: Dart SHP Iron, 7/16" Head Threads, 7/16" Main Bolts, 4.125" Bore
Crankshaft: Smeding 4340 8-Cwt LS7, Internal Balance, 4.000" Stroke, 58x
Rods: Smeding 4340 Forged Steel Pwr Adr 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: Smeding 4340 8-Cwt LS7, Internal Balance, 4.000" Stroke, 58x
Rods: Smeding 300m Billet Steel Pwr Adr 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, Std Tension Oil

Camshaft Kit Includes: Smeding Forged Camshaft, Gaterman Link-Bar Hydraulic Roller Lifters & 4x Timing Set - Installed

Sealed-Up Kit Includes: GM Rear Main Seal Cover, LS7 Front Timing Cover & LS Valley Cover - Installed

Note - LS7 oil pan must be reused from previous engine.

Final assembly & tuning of this partial engine must be completed by an experienced engine assembler/builder. Smeding Performance is not responsible for damaged caused by user installed parts.

Power Adder engines carry a 1yr workmanship guarantee.