Restore engine compression on your Porter with 22100-32680 cylinder head. Fits 4G64 8V 2.4L. AC4C aluminum resists warpage. Contact us for wholesale pricing
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High-durability 8V SOHC cylinder head for Hyundai 4G64 (2.4L Sirius) and Mitsubishi G4CS engines. Cast from T6 heat-treated AC4C aluminum alloy with CNC deck surfacing to eliminate overheating warpage and valve seat recession. OEM: 22100-32680 | Cross ref: MD099389.
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The Hyundai 4G64 Cylinder Head (OEM 22100-32680) is an essential automotive engine core part engineered to sustain the thermal loads of early 2.4-liter Sirius gasoline powertrains. Serving high-utilization commercial transport and delivery fleets including the Hyundai Porter, Grace, and Starex, this 2.4L SOHC cylinder head operates under continuous stop-and-go cycles. These severe operating profiles often trigger chronic cooling deficiencies, resulting in critical overheating warpage and valve seat recession. Over time, high exhaust gas temperatures also lead to thermal expansion imbalances, leading to common manifold stud breakage. To address these vulnerabilities, Ruich Value manufactures this 4G64 8V engine head from premium gravity-cast, heat-treated aluminum alloy (AC4C-T6).
Every casting undergoes precise T6 heat treatment to reinforce the grain structure around the valve seat pockets and combustion chambers, preventing recession and thread stripping. Our state-of-the-art CNC deck surfacing ensures a deck flatness tolerance of under 0.05 mm, restoring a robust metal-to-metal head gasket seal and eliminating combustion leaks. Additionally, each unit is pressure tested at 4.5 bar under heated conditions to confirm absolute casting integrity before packaging. For professional engine rebuilders, fleet maintenance operations, and parts distributors, this cylinder head offers a reliable, dimensionally perfect replacement that eliminates recurring warpage issues and ensures maximum vehicle uptime.
| Parameter | Value |
|---|---|
| Engine Model Compatibility | Hyundai 4G64 / G4CS & Mitsubishi 4G64 (Sirius 2.4L SOHC 8V) |
| Primary OEM Number | 22100-32680 |
| Cross-Reference Numbers | MD099389, MD040520, 22100-32520, 2210032680 |
| Structural Metallurgy | AC4C Gravity-Cast Aluminum Alloy |
| Heat Treatment Code | T6 Solution & Artificial Aging |
| Valvetrain Configuration | Single Overhead Camshaft (SOHC), 8 Valves (2V per Cylinder) |
| Deck Machining Quality | CNC Milled with Flatness Tolerance < 0.05 mm |
| Testing Standard | Pressure Tested at 4.5 Bar (Heated Verification) |
| Cylinder Bore Size | 86.50 mm (Standard Specification) |
| Combustion Chamber Volume | Factory OEM Compliant Volume |
| Camshaft Saddle Finish | Line-Bored for Perfect Concentricity |
Our comprehensive Hyundai engine catalog covers a full range of heavy-duty cylinder heads, from the classic SOHC 8-valve petrol series to the modern CRDi DOHC diesel families. Auto parts distributors and professional workshops can explore our whole Hyundai Categories to discover direct-fit replacement crankshafts, camshafts, and cylinder heads designed for passenger and light commercial fleets.
| Primary Part Number | Cross Ref Part Numbers | Compatible Engine Model | Compatible Machine Model |
|---|---|---|---|
| 22100-27000 | 2210027901, 2210027900 | D4EA | Hyundai Santa Fe, Tucson |
| 22100-2A350 | 221002A100, 220002A000 | D4FA | Hyundai Accent, i30 |
| 22100-42000 | 908512, 2210042003 | D4BA / D4BB | Hyundai H100 Porter |
| 22100-42U00 | 908511, 2210042U00 | 4D56 / 4D55 | Hyundai Porter, H100 |
| 22100-42530 | 908513, 2210042530 | D4BA / D4BH | Hyundai Terracan, Starex |
| 22100-42700 | 908770, 42900, 42201, 42200 | D4BA / 4D56 | Hyundai Porter, Grace |
| 22100-32540 | 2210032540, 4G63 | 4G63 Sirius | Hyundai Sonata, Santamo |
| 22100-35000 | 2210036000, 2210035000 | 6G72 Sigma | Hyundai Sonata V6, Azera |
| 22100-32680 | MD099389, 2210032680 | 4G64 Sirius | Hyundai Porter, H100 |
| 22100-24000 | 908029, XUD9 | XUD 9 A/L | Hyundai Lantra, Pony |
| 22100-4X910 | 221114X910, 221004X700 | J3 Engine | Hyundai Terracan, Kia Carnival |
| 22100-42750 | 908771, 2210042750 | D4BF (Compatible 4D56) | Hyundai Galloper, Grace |
| 22100-42710 | 908771, 2210042710 | D4BF (Compatible 4D56) | Hyundai Starex, H100 |
| 22100-42400 | 908772, 2210042400 | D4BH (Compatible 4D56T) | Hyundai Terracan, Libero |
| 22100-2G051 | 221002G000, G4KE | G4KE / G4KC | Hyundai Sonata, Santa Fe |
| 22100-4A410 | 221004A210, 221004A400, 221004A250 | D4CB VGT | Hyundai H1 Starex, Sorento |
| 22100-27400 | 2210027750, 2210027800 | D4EB / 4DEA-V | Hyundai Santa Fe, Azera |
| 22100-4A020 | 221004A000, 221004A010 | D4CB-A | Hyundai Porter II, Libero |
| 22100-27500 | 2210027501, D3EA | D3EA | Hyundai Accent, Matrix |
| 22100-4A000 | 221004A060, 221004A010, 221004A250 | D4CB | Hyundai H1, Starex |
| 22100-84200 | D6AC, Truck | D6AC | Hyundai HD120, HD170 |
| 22100-48701 | HD35, HD65, Mighty | HD35 / HD65 | Hyundai Mighty HD65 |
| 22100-42900 | 908512, 22001-427A1, 2210042900 | D4BA / D4BAT | Hyundai H100, Hyundai H1 |
| Make | Machine Model | Year Range | Engine | Application |
|---|---|---|---|---|
| Hyundai | Porter H100 Truck | 1993–2004 | 4G64 / G4CS 2.4L | Light Utility Cargo Transport |
| Hyundai | Grace Minibus / Van | 1993–2003 | 4G64 SOHC 8V | Multi-Passenger Shuttle Fleet |
| Hyundai | Starex / H1 (Early Petrol) | 1997–2004 | Sirius 2.4L 8V | Passenger & Light Commercial Cargo |
| Mitsubishi | L300 Van / Delica | 1986–1999 | 4G64 SOHC 8V | Urban Courier Delivery Van |
| Mitsubishi | L400 Starwagon | 1994–2002 | 4G64 2.4L | Multi-Purpose Utility Vehicle |
| Mitsubishi | Pajero 2.4 / Shogun | 1991–1999 | 4G64 SOHC 8V | Family & Utility Off-Road SUV |
The 4G64 SOHC 8V engine uses a cast iron cylinder block paired with an aluminum alloy cylinder head. Because aluminum expands at more than double the rate of cast iron under thermal loads, any cooling system failure (such as a clogged radiator or failing water pump) causes rapid thermal expansion imbalances. This results in severe overheating warpage across the cylinder head deck, crushing the head gasket and allowing combustion gases to leak into the coolant passages. Our heads feature CNC surfaced decks with flatnesses under 0.05 mm to maintain a robust gasket seal under high thermal stress.
No, they are completely incompatible. The SOHC 8-valve 4G64 engine (Sirius, SOHC 8V) uses a single camshaft driving two valves per cylinder with a specific combustion chamber shape and intake port design. The 16-valve SOHC or DOHC 4G64 engines feature completely different oil control passages, timing belt drive geometry, spark plug placements, and water jackets. Attempting to install an 8V head like the 22100-32680 onto a 16V block will result in immediate timing component mismatch, oil starvation, and severe valvetrain damage. Always match the exact SOHC 8V OEM reference.
Our AC4C aluminum heads undergo a meticulous T6 solution and artificial aging heat treatment. Un-treated or low-quality aftermarket aluminum castings often soften under the constant hammering of the steel valves, leading to rapid valve seat recession where the valves sink into the head, causing loss of compression and rough idling. The T6 treatment increases the material’s structural hardness and yield strength, especially around the valve seat pockets and spark plug threads. This ensures the valve seats remain firmly anchored and resist recession even under high combustion temperatures.
Proper installation is critical to prevent future warpage and manifold stud breakage. Cylinder head bolts must be replaced with new, high-tensile fasteners during rebuilds. In a multi-stage, star-pattern sequence starting from the center and working outward, torque the bolts first to 22 ft-lb (30 Nm), then to 44 ft-lb (60 Nm), and finally to a spec of 65-72 ft-lb (88-98 Nm) on a cold engine. Apply a high-quality anti-seize compound to the exhaust manifold studs to prevent thread galling and future stud breakage during heat cycling.
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