427" LS3 Long Block

The Smeding 427" LS Long Block is offered in three 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, 6 Bolt 7/16" Head Threads, 7/16" Main Bolts, 4.125" Bore
Crankshaft: Smeding 4340 8 Counterweight, 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, 1.2/1.5/3.0
Camshaft: Smeding Forged Steel Hydraulic Roller
Lifters: Gaterman Link-Bar Hydraulic Roller
Timing Set: Performance Single Roller, 4x
Oil Pump: Melling Oil Pump
Cylinder Heads: Smeding CNC Ported 11° 6 Bolt LS3 Heads
Head Gaskets: Cometic MLX 5-Layer Head Gaskets
Head Fasteners: 6 Bolt ARP Head Stud Kit - 7/16"
Pushrods: Manley Chromoly Swedged End Pushrods
Rocker Arms: GM LS3 w/ Upgraded Trunnions

1700hp:
Block: Dart SHP PRO Iron, 6 Bolt 1/2" Head Threads, 7/16" ARP Main Studs, 4.125" Bore
Crankshaft: Smeding 4340 8 Counterweight, 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, 1.2/1.5/3.0
Camshaft: Smeding Forged Steel Hydraulic Roller
Lifters: Gaterman Link-Bar Hydraulic Roller
Timing Set: Performance Single Roller, 4x
Oil Pump: Melling Oil Pump
Cylinder Heads: Smeding CNC Ported 11° 6 Bolt LS3 Heads
Head Gaskets: Cometic MLX 5-Layer Head Gaskets
Head Fasteners: 6 Bolt ARP/Dart Head Stud Kit - 1/2"
Pushrods: Manley Chromoly Swedged End Pushrods
Rocker Arms: GM LS3 w/ Upgraded Trunnions

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.