The Chevrolet L36 (231CUV6) is a 3.8 L (231 cu in), 90° V6 engine produced between 1987 and 1995. It features a cast — iron block and cylinder heads with a 2 — valve pushrod valvetrain and sequential fuel injection (SFI). This naturally aspirated engine was engineered for durability and smooth power delivery in full — size cars and light trucks. In standard form, it delivered 140 kW (188 PS) and 305 Nm of torque.
Fitted to key platforms including the Chevrolet Caprice, Impala, an…
Production years 1987–1995 meet U.S. EPA Tier 0 standards; Canadian models comply with equivalent Transport Canada regulations (EPA File #EPAC-87-031).
The Chevrolet L36 (231CUV6) is a 3,791 cc V6 engineered for full-size sedans and vans (1987–1995). It combines a pushrod valvetrain with sequential fuel injection to deliver smooth, linear power delivery. Designed to meet U.S. EPA Tier 0 standards, it balances fleet-grade reliability with everyday drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,791 cc | |
Fuel type | Gasoline | |
Configuration | 90° V6, OHV, 12-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 99.3 mm × 81.3 mm | |
Power output | 140 kW (188 PS) | |
Torque | 305 Nm @ 2,800 rpm | |
Fuel system | Sequential Fuel Injection (SFI) | |
Emissions standard | U.S. EPA Tier 0 | |
Compression ratio | 9.2:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven (double roller) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 182 kg |
The Chevrolet L36 (231CUV6) was used across Chevrolet's W-body and B-body platforms with longitudinal mounting and shared with Pontiac and Oldsmobile in North American markets. This engine received platform-specific adaptations-intake tuning in the Lumina and transmission pairing in the Caprice-and from 1993 revised gasket materials were implemented to address coolant leaks, creating service part differences. Partnerships allowed GM's full-size van and sedan divisions to standardize on the 3.8L V6 architecture. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
The L36's primary reliability risk is intake manifold gasket failure on early builds, with elevated incidence in high-temperature climates. Internal GM field reports from 1992 indicated a significant number of pre-1993 units required gasket replacement before 100,000 km, while EPA durability data links coolant-related failures to long-term fleet use. Extended idling and poor coolant maintenance increase gasket stress, making regular inspection and use of OEM-spec coolant critical.
Analysis derived from General Motors technical bulletins (1987-1995) and U.S. EPA durability reports (1990-1996). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The L36 is a durable pushrod V6 known for longevity when properly maintained. Early models (1987–1992) are prone to intake manifold gasket leaks, but post-1993 revisions resolved most issues. Regular oil changes, coolant service, and attention to gasket integrity ensure reliable operation beyond 200,000 km in fleet and personal use.
The most documented issues are intake manifold gasket leaks, rocker arm wear, EGR clogging, and water pump failures. These are covered in GM service bulletins and field reports. Preventive maintenance significantly reduces the risk of major repairs.
The L36 was used in the Chevrolet Caprice, Impala, and Lumina APV minivan from 1987 to 1995. It was also shared with Pontiac Trans Sport and Oldsmobile Silhouette under GM's platform-sharing strategy. All are longitudinal front-engine, rear- or front-wheel-drive configurations.
Yes, though modestly. The L36 responds well to intake/exhaust upgrades, cam swaps, and carburetor-to-SFI conversions. Forced induction is possible but requires significant modification. Most enthusiasts focus on reliability and drivability rather than high-output tuning.
Fuel economy is moderate by modern standards. In a Caprice or Impala, expect 14–16 L/100km (18–20 mpg UK) city and 10–12 L/100km (24–28 mpg UK) highway. Real-world consumption depends on vehicle weight and driving style, but it was not designed as a fuel-sipping engine.
No. The L36 is a non-interference engine. If the timing chain fails, the pistons will not contact the valves, preventing catastrophic internal damage. However, immediate repair is still advised to avoid secondary issues from poor timing.
GM specifies SAE 10W-30 or 5W-30 oil meeting API SG or SH standards. Use of conventional or synthetic blend oil is acceptable. Change intervals should not exceed 15,000 km to protect hydraulic lifters and upper valvetrain components.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.