The Dodge 4G63 is a 1,997 cc, inline-four gasoline engine produced between 1990 and 2005. It features a cast-iron block with an aluminum DOHC 16-valve head and was offered in both naturally aspirated and turbocharged configurations. The turbo variant delivers 175–210 kW (235–280 PS) and up to 300–390 Nm of torque, making it a performance benchmark in its era.
Fitted primarily to the Dodge Stealth R/T Turbo and Dodge Daytona R/T, the 4G63T was engineered for high-performance driving and enthusiast appeal. Its design emphasizes strong mid-range power delivery and turbo responsiveness, suitable for spirited driving and motorsport applications. Emissions compliance was achieved through multi-point fuel injection and catalytic converter systems, meeting U.S. Tier 1 and California LEV standards.
One documented reliability concern is premature head gasket failure under sustained boost or overheating conditions, particularly in early 1990–1992 models. This issue, referenced in Chrysler Technical Service Bulletin 18-11-91, is linked to cylinder head bolt torque retention and thermal cycling stress. Later revisions included upgraded head gaskets and improved cooling system calibration to enhance durability.
Production years 1990–1994 meet U.S. EPA Tier 1 standards; 1995–2005 models comply with LEV I/II depending on market (EPA VIN-Level Certification #EPA/DODGE/4G63/TC).
The Dodge 4G63 is a 1,997 cc inline-four gasoline engine engineered for performance applications (1990–2005). It combines DOHC 16-valve architecture with either natural aspiration or variable-vane turbocharging to deliver responsive power and high-RPM performance. Designed to meet U.S. emissions standards, it balances track-ready capability with street drivability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,997 cc | |
| Fuel type | Gasoline | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (variable-vane) or naturally aspirated | |
| Bore × stroke | 85.0 mm × 88.0 mm | |
| Power output | 175–210 kW (235–280 PS) | |
| Torque | 300–390 Nm @ 3,000–4,500 rpm | |
| Fuel system | Multi-point fuel injection (MPI) | |
| Emissions standard | U.S. Tier 1 (1990–1994); LEV I/II (1995–2005) | |
| Compression ratio | 8.5:1 (turbo), 9.0:1 (NA) | |
| Cooling system | Water-cooled | |
| Turbocharger | Mitsubishi TD05H-16G6-9K (variable-vane) | |
| Timing system | Timing belt (interference design) | |
| Oil type | SAE 10W-30 or 5W-30 (API SL/SM) | |
| Dry weight | 145 kg |
The turbocharged 4G63 delivers strong mid-range torque ideal for performance driving but requires strict adherence to 90,000-mile timing belt replacement intervals to prevent valve/piston collision. SAE 5W-30 API SM oil is recommended for thermal stability under boost. Pre-1993 models are prone to head gasket failure under high load; upgraded MLS gaskets and proper bolt torque procedures per TSB 18-11-91 mitigate risk. The variable-vane turbo requires clean oil feed and periodic actuator inspection to maintain boost control. Post-1995 models feature improved ECU tuning and cooling systems, enhancing reliability in modified applications.
Oil Specs: Requires SAE 10W-30 or 5W-30 API SL/SM specification (Dodge Owner's Manual 1993). Not compatible with GF-5 or dexos1 without engineering review.
Emissions: Tier 1 certification applies to 1990–1994 models only (EPA #EPA/DODGE/4G63/TC). LEV I/II compliance varies by model year and state.
Power Ratings: Measured under SAE J1349 standards. 210 kW output requires 91 octane fuel and stock boost levels (Dodge PT-2000).
Dodge Technical Service Bulletins (TSBs): 18-11-91, 22-04-95, 15-08-93
EPA Type Certification Database (EPA/DODGE/4G63/TC)
SAE International: J1349 Engine Power Test Code
The Dodge 4G63 was used across Dodge's Stealth and Daytona platforms with longitudinal mounting and shared with Mitsubishi under platform partnership agreements. This engine received application-specific tuning—higher boost in the Stealth R/T Turbo and revised intake manifolds in the Daytona R/T—and from 1995, OBD-II compliance introduced updated ECU calibration, creating interchange limits. Partnerships enabled shared use of the Mitsubishi 4G63T in DSM (Diamond Star Motors) vehicles. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the passenger-side cylinder block near the exhaust manifold (Dodge TSB 22-04-95). The 8th VIN digit identifies the engine ('T' for turbo 4G63). Pre-1993 models use a tan valve cover with black accents; post-1995 units have black valve covers. Critical differentiation from non-turbo: Turbo models feature an integrated turbo manifold and intercooler piping. Service parts require model-year verification—timing belts for pre-1995 models are not compatible with OBD-II variants due to crankshaft sprocket redesign (Dodge TSB 22-04-95).
The 4G63T's primary reliability risk is head gasket failure on early builds, with elevated incidence in high-boost or overheated applications. Internal Dodge service data from 1992 indicated over 15% of pre-1993 turbo models required head gasket replacement before 100,000 miles, while NHTSA field reports confirm timing belt neglect as a leading cause of catastrophic engine failure. Aggressive driving and improper maintenance increase thermal and mechanical stress, making coolant system integrity and belt replacement critical.
Analysis derived from Dodge technical bulletins (1990-1998) and NHTSA failure statistics (1995-2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about DODGE 4G63.
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