LSx 427ci Boosted Complete Engine $18,499 - The LSx 427ci Boosted Complete Engine was built for customers that are looking to run 20-30 psi of boost and 1000hp +. Compression Ratio: 9.5:1 Operating Range: 2500 – 6700rpm Required Fuel: 91+ Octane Pump Gasoline LSx 427ci Boosted Complete Engine quantity Add to cart Categories: LSx Complete Engines, LSx Crate Engines ENGINE SPECIFICATIONS BLOCK SPECIFICATIONS Block: New GM LSx Cast Iron Block Zero Decked Bored 4.125” Honed with Torque Plates and Pressure Washed New Durabond Cam Bearings Installed Line Honed ARP Main Studs Pistons: Wiseco Forged Pistons, tool steel wrist pins Bearings: Clevite H-Series Main and Rod Bearings Lifters: Comp Cams Custom Hydraulic Roller Covers: GM Oil Pan (Camaro, Corvette, GTO or Truck) GM Timing Cover GM Rear Cover GM Lifter Valley Cover GM Valve Covers Damper: Powerbond SFI ARP Damper Bolt Crank: Callies Dragon Slayer 4340 Forged Steel 4.000” stroke Internally Balanced Front and Rear Rods: Callies 4340 Ultra Forged H-Beam 6.125” Length ARP 2000 Rod Bolts Rings: Stainless Steel Rings Gapped for Boost Camshaft: Comp Cams Hydraulic Roller Timing Sets: Cloyes Billet Roller Hex Adjust Z-Chain Oil Delivery: Melling Performance GM Pick Up Tube GM Windage Tray Gaskets: Cometic MLS Head Gaskets .051” GM Cover Gaskets CYLINDER HEAD SPECIFICATIONS Type: Golen Aftermarket LS Aluminum CNC Ported Three angle performance valve job Intake Valves: Stainless Steel 2.20” Exhaust Valves: Extreme Duty Inconel Stainless Steel 1.6” Head Bolts: ARP Performance Heads Studs 6-bolt Combustion Chamber: 70cc Flow: 380CFM @ .650” Lift Spring Kit: Polished Double Valve Spring Titanium Retainers and Hardened Locks Rocker Arms: GM Factory 1.7 Ratio, Comp Cam Trunion Upgrade Pushrods: Smith Brothers 3/8 .083” Wall Hardened Ignition System: Autolite Racing Spark Plugs Dyno Test Service: Run Engine for Full Break In and Power Test 2 Oil Changes using Joe Gibbs Break In Oil Graphs Listing HP, Torque and all Engine Vitals