Restore factory power and oil control with this Hyundai Sonata Kia Optima G4KC Remanufactured Engine. Each 2.4L 4-Cylinder 16-Valve assembly features casting G4KC with intake CVVT architecture. Production machine work restores original journal tolerances. Installers must prime the oil pump cavity prior to ignition to prevent dry aluminum camshaft scuffing during initial crank.

The structural platform uses a high-grade die-cast aluminum cylinder block with cast iron cylinder sleeves and cylinder head casting THETA K#. Micro-polished crankshaft journals pair with select tri-metal rod bearings to prevent oil film shearing. Precision-machined aluminum pistons seat into diamond-honed cylinder walls for rapid ring seal. Dry long block weight measures 247 lbs. The crated envelope dimensions span 36in length by 36in width by 36in height. The oil pan holds 4.5 quarts of motor oil.

Key Features of Hyundai G4KC

Repair shops buy Hyundai G4KC remanufactured engine assemblies to restore fleet reliability and pass tailpipe emissions standards. This precision long block replaces worn factory units across passenger sedans and crossover platforms.

- Block cast G4KC undergoes CNC deck resurfacing to secure flat cylinder head gasket retention.
- Cylinder head casting THETA K# holds valve seat concentricity within 0.001in runout across intake ports.
- Intake CVVT cam phasers receive bench inspection to guarantee precise valve timing advance.
- Shimless bucket lifters maintain exact lash clearances to eliminate valvetrain tap.
- Multi-layer steel head gaskets seal combustion chambers against coolant jacket intrusion.
- Precision align-honed main bearing saddles maintain hydrodynamic oil film stability under load.
- High-tensile torque-to-yield cylinder head bolts prevent combustion gas blowby at elevated temperatures.

Dyno Load Precision Machining Tolerances

Dyno load cell testing verifies 162 HP at 6,000 RPM and 164 ft-lbs of shaft torque at 4,000 RPM. Crankshaft journal runout measures less than 0.0003in TIR while connecting rod oil clearance holds at 0.0012in to 0.0016in. Cylinder bores receive diamond plateau honing to produce a 12 to 18 Ra surface finish for oil retention. Hot oil pressure registers 55 PSI at 3,000 RPM at a regulated 195°F coolant temperature. Individual cylinder compression checks produce 185 PSI across all 4 cylinders. Machinists measure camshaft journal clearance to 0.0015in to support consistent variable timing oil flow.

Vehicle Fitment Drivetrain Guide

This long block assembly fits 2006 to 2008 Hyundai Sonata, 2006 to 2008 Kia Optima, 2007 to 2008 Kia Magentis, and 2007 to 2008 Kia Rondo models equipped with the 2.4L 2359cc engine code G4KC and engine VIN code C. Application applies to vehicles built up to production date 11/2007 paired with FWD automatic or 5-Speed manual transmissions. This unit does not fit 2009 or newer Theta II Dual CVVT engines, 2.0L turbo variants, or GDI gasoline direct injection platforms.

Installation Protocol Service Requirements

Inspect electronic throttle body wiring harnesses and engine mount brackets prior to engine drop. Mechanics must flush the vehicle oil cooler and radiator core to remove metallic debris from prior engine failure. Never install aftermarket turbocharger systems exceeding stock cylinder pressure on this non-turbo engine platform.

- Fill crankcase with 5W-20 break-in oil and prime the oil galleries before starter engagement.
- Drain the initial oil charge and replace the spin-on filter at 500 miles to capture break-in particulates.
- Inspect drive belts and complete standard engine oil service intervals at 3,000 miles or 5,000 miles.

Warranty Terms Core Return Policy

This product includes a 3-Year Unlimited-Mile parts warranty for complete buyer protection. Return your old engine core within a 30-day window using prepaid freight shipping labels. The secure wooden shipping crate contains the remanufactured long block assembly, pre-installed timing components, oil pan, valve cover, and machine shop specification sheets.