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: Performan