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" BoreCrankshaft: Smeding 4340 8 Counterweight, Internal Balance, 4.000" Stroke, 58xRods: Smeding 4340 Forged Steel Pwr Adr H-Beam w/ ARP2000 Bolts, 6.125" LengthPistons: Wiseco 2618 Forged Aluminum, Coated Skirts & 0.200" PinsRings: Stainless Steel Top, Napier 2nd, Low Tension Oil, 1.2/1.5/3.0Camshaft: Smeding Forged Steel Hydraulic RollerLifters: Gaterman Link-Bar Hydraulic RollerTiming Set: Performance Single Roller, 4xOil Pump: Melling Oil PumpCylinder Heads: Smeding 275cc CNC Ported 11° 6 Bolt LS3 HeadsHead Gaskets: Cometic MLX 5-Layer Head GasketsHead Fasteners: 6 Bolt ARP Head Stud Kit - 7/16"Pushrods: Manley Chromoly Swedged End PushrodsRocker 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" BoreCrankshaft: Smeding 4340 8 Counterweight, Internal Balance, 4.000" Stroke, 58xRods: Smeding 300m Billet Steel Pwr Adr I-Beam w/ ARP2000 Bolts, 6.125" LengthPistons: JE Ultra 2618 Forged Aluminum, Coated Skirts, Gold Thermal Barrier & 0.200" PinsRings: Stainless Steel Top, Napier 2nd, Std Tension Oil, 1.2/1.5/3.0Camshaft: Smeding Forged Steel Hydraulic RollerLifters: Gaterman Link-Bar Hydraulic RollerTiming Set: Performance Single Roller, 4xOil Pump: Melling Oil PumpCylinder Heads: Smeding 275cc CNC Ported 11° 6 Bolt LS3 HeadsHead Gaskets: Cometic MLX 5-Layer Head GasketsHead Fasteners: 6 Bolt ARP/Dart Head Stud Kit - 1/2"Pushrods: Manley Chromoly Swedged End PushrodsRocker 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.