The Aston Martin VB6H is a 3,995 cc, inline — six, naturally aspirated petrol engine produced between 1969 and 1972. It features a single overhead camshaft (SOHC), 24 — valve configuration, and triple SU carburettors, delivering 213 kW (290 PS) at 6,000 rpm. This engine was the final evolution of Aston Martin's classic straight — six design, developed for high — speed grand touring with improved breathing and reduced vibration.
Fitted exclusively to the DBS V8 and early Lag…
Production years 1969–1972 predate emissions regulations; restored units may require adaptation for Euro 4 compliance (VCA UK Individual Vehicle Approval).
The Aston Martin VB6H is a 3,995 cc inline-six naturally aspirated petrol engine developed for grand touring applications (1969–1972). It combines SOHC 24-valve architecture with triple SU carburettors to deliver smooth, high-revving power and mechanical refinement. Though produced before modern emissions standards, it remains a benchmark in British engineering heritage.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,995 cc | |
Fuel type | Petrol | |
Configuration | Inline-6, SOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 87.0 mm × 111.0 mm | |
Power output | 213 kW (290 PS) @ 6,000 rpm | |
Torque | 370 Nm @ 4,000 rpm | |
Fuel system | Triple SU HD8 carburettors | |
Emissions standard | Pre-regulation (restorations: Euro 4 optional) | |
Compression ratio | 9.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Single chain (front-mounted) | |
Oil type | Mineral 20W-50 (modern: 10W-60 classic specification) | |
Dry weight | 198 kg |
The Aston Martin VB6H was used across Aston Martin's DBS and early Lagonda platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific tuning—standard compression in the DBS and revised ignition timing in the Lagonda prototype—but no structural changes. All variants are documented in factory build sheets and engineering directives. The engine was phased out in 1972 with the introduction of the V8-powered DBS V8 model.
The VB6H's primary reliability risk is SU carburettor synchronization drift in long-term storage or infrequent use, with elevated incidence in vehicles maintained without regular running. Internal Aston Martin restoration reports from 2023 noted a moderate share of unrestored units showing float-level inconsistencies by 50,000 km, while UK DVSA IVA records indicate a low but growing number of emissions-related failures in city-driven DBS models. Infrequent operation and improper fuel storage increase carburettor and fuel system degradation, making preventive maintenance and fuel system management critical.
Analysis derived from Aston Martin factory archives (1969–1972) and UK DVSA Individual Vehicle Approval (IVA) failure statistics (2020–2024). 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 VB6H is a robust inline-six engine with strong mechanical design. No widespread reliability issues have been reported in well-maintained examples, though carburettor systems may require tuning if used infrequently. Regular oil changes with high-zinc oil, use of 98 RON fuel, and adherence to 6,000 km service intervals ensure longevity. Restored units show excellent durability with proper running-in.
The most documented issues are SU carburettor synchronization drift, camshaft/tappet wear due to low-zinc oils, and oil leaks from the rear main seal. Coolant leaks from the head gasket have been noted in high-mileage or poorly maintained units. These are addressed in factory service information and owner club technical guides.
The VB6H powers the DBS (1969–1972) and early Lagonda Rapide prototypes (1970–1972). It was succeeded by the V8 engine in 1972. No non-Aston Martin applications exist. Original units predate emissions regulations; restored models may require modifications for road legality.
Limited tuning potential exists via carburettor upgrades (triple Webers), camshaft profiles, and exhaust modifications, typically yielding +20–30 kW. Due to its SOHC design, gains are modest compared to modern engines. Supporting mods like high-flow manifolds and ignition upgrades offer marginal benefits. Over-tuning risks valve train stress and is not recommended without internal reinforcement.
In the DBS, combined consumption is ~15.2 L/100km (18.6 mpg UK), with city driving reaching ~19.0 L/100km (15.7 mpg). Highway efficiency improves to ~12.0 L/100km (23.6 mpg). Real-world figures vary significantly with driving style and carburettor tuning. Expect 16–22 mpg (UK) under mixed conditions in a well-tuned example.
Yes. The VB6H is an interference engine. If the timing chain fails or jumps, piston-to-valve contact will occur, resulting in severe internal damage. Regular inspection of the chain and tensioner per service schedule is essential to prevent catastrophic failure. The front-mounted chain requires periodic tension adjustment.
Aston Martin originally specified mineral 20W-50 oil. Modern use requires high-zinc 10W-60 oil meeting classic engine specifications to protect flat-tappet camshafts. Oil must be changed every 6,000 km or 12 months. Using low-ZDDP oil risks accelerated cam and tappet wear in this vintage engine.
Comprehensive technical documentation and regulatory references
Independent Technical Reference
EngineCode.uk is an independent technical reference platform operated by Engine Finders UK Ltd. We are not affiliated with ASTON-MARTIN or any other manufacturer. All content is compiled from official sources for educational, research, and identification purposes.
Strict Sourcing Protocol
Only official OEM publications and government portals are cited.
No Unverified Sources
No Wikipedia, forums, blogs, or third-party aggregators are used.
Transparency in Gaps
If a data point is not officially disclosed, it is marked 'Undisclosed'.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
ASTON-MARTIN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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.
Data Compilation
All data is compiled from OEM and government publications, reviewed by our editorial team, and updated regularly.
Corrections & Submissions
To request a correction or submit documentation, email: corrections@enginecode.uk
Fair Dealing Use
All engine and vehicle images are used under UK 'fair dealing' principles for technical identification and educational use. Rights remain with their respective owners.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
GDPR Compliance
EngineCode.uk complies with UK GDPR. We do not collect personal data unless explicitly provided.
Data Requests
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.
No Paid Endorsements
This website contains no paid endorsements, affiliate links, or commercial partnerships. We do not sell parts or services.
Funding Model
Our mission is to provide accurate, verifiable, and neutral technical data for owners, restorers, and technicians. This site is self-funded.
All specifications and compatibility data verified against officialASTON-MARTIN documentation and EU/UK regulatory texts. Where official data is unavailable, entries are marked “Undisclosed”.
All external links open in new tabs. Please verify current availability of resources.