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.

900hp:
Block: Dart SHP Iron, 6 Bolt 7/16" Head Threads, 7/16" Main Bolts, 4.125" Bore
Crankshaft: Smeding 4340 6 Counterweight, Internal Balance, 4.000" Stroke, 58x
Rods: Smeding 4340 Forged Steel H-Beam w/ 8740 Bolts, 6.125" Length
Pistons: JE 2618 Forged Aluminum, Coated Skirts & 0.170" 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 10295 Std. Volume / High Pressure
Cylinder Heads: Smeding 260cc 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

1200hp:
Block: Dart SHP Iron, 6 Bolt 7/16" Head Threads, 7/16" Main Bolts, 4.125" Bore
Crankshaft: Smeding 4340 6 Counterweight, Internal Balance, 4.000" Stroke, 58x
Rods: Smeding 4340 Forged Steel H-Beam w/ ARP2000 Bolts, 6.125" Length
Pistons: JE 2618 Forged Aluminum, Coated Skirts & 0.170" 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 10295 Std. Volume / High Pressure
Cylinder Heads: Smeding 260cc 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

1500hp:
Block: Dart SHP PRO Iron, 6 Bolt 1/2" Head Threads, 7/16" ARP Main Studs, 4.125" Bore
Crankshaft: Callies Compstar 8 Counterweight, Internal Balance, 4.000" Stroke, 58x
Rods: Smeding 300m Billet Steel 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 10295 Std. Volume / High Pressure
Cylinder Heads: Smeding 260cc 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.

All of our engine packages are extremely flexible and can be customized! If there is an option you would like and do not see, please call us at 210-446-0960.