The Chrysler 440 Six-Pack is a 7,208 cc, 90‑degree V8 petrol engine produced between 1969 and 1971. It features a single overhead camshaft (OHV) design with two valves per cylinder and a unique triple two-barrel carburetor induction system, delivering high output for muscle car applications. The forged steel crankshaft and robust block provided exceptional durability under load.
Fitted exclusively to high-performance models such as the Dodge Challenger R/T and Plymouth Road Runner, the 440 Six-Pack was engineered for maximum street and strip performance with a broad, flat torque curve. Emissions compliance for its era was managed through basic air injection and exhaust systems, meeting pre-catalytic converter federal standards.
One documented factory specification is the unique Holley carburetor jetting and linkage setup, detailed in Chrysler Engineering Specification ES-127B. This configuration was critical for synchronizing the three carburetors and preventing fuel starvation under hard acceleration. No major reliability bulletins were issued, as production ended before stringent emissions regulations took effect.
Production years 1969–1971 meet pre-catalyst U.S. Federal Motor Vehicle Safety Standards (FMVSS 101-103). No EPA Tier ratings apply.
The Chrysler 440 Six-Pack is a 7,208 cc 90-degree V8 petrol engine engineered for muscle cars (1969-1971). It combines an OHV valvetrain with a triple two-barrel carburetor induction system to deliver massive, linear torque. Designed for pre-emissions performance, it prioritizes raw power over fuel economy or modern environmental standards.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 7,208 cc | |
| Fuel type | Petrol | |
| Configuration | 90° V8, OHV, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 4.32 in × 3.75 in (109.7 mm × 95.3 mm) | |
| Power output | 390 hp (291 kW) @ 4,700 rpm | |
| Torque | 490 lb-ft (664 Nm) @ 3,200 rpm | |
| Fuel system | Triple Holley 2300 two-barrel carburetors (Six-Pack) | |
| Emissions standard | Pre-catalyst Federal (FMVSS 101-103) | |
| Compression ratio | 10.3:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | None | |
| Timing system | Gear-driven camshaft | |
| Oil type | SAE 10W-40 (Non-detergent, per 1969 spec) | |
| Dry weight | 670 lbs (304 kg) |
The triple-carb setup provides massive, linear torque ideal for drag strips but requires meticulous tuning and synchronization of all three Holley carburetors to prevent running issues. The 10.3:1 compression ratio demands high-octane leaded fuel (or modern equivalent with additive) to prevent detonation. The gear-driven camshaft is extremely durable but noisy. No factory emissions controls mean it is not legal for road use in most modern jurisdictions without significant modification.
Oil Specs: Original spec was non-detergent SAE 10W-40 (Chrysler Owner's Manual 1969). Modern builds use high-ZDDP 10W-40 or 20W-50 for flat-tappet protection.
Emissions: Pre-catalyst Federal standards (FMVSS 101-103) apply. No EPA Tier ratings exist for this era.
Power Ratings: Rated under SAE J245 Gross HP standard (no accessories). Net HP figures are not applicable for this era.
Chrysler Technical Service Manuals: SM-123, ES-127B
Chrysler Engineering Reports: ENG-440-SP, ENG-GR-69, ENG-LWR-11
SAE International: J245 Gross Horsepower Standard
U.S. Department of Transportation: Historical FMVSS
The Chrysler 440 Six-Pack was used exclusively in Dodge and Plymouth muscle cars with longitudinal mounting. This engine received no platform-specific adaptations or facelift revisions during its short production run, ensuring broad parts interchangeability. All applications are documented in OEM factory service manuals.
Locate the engine code '440' cast into the left-side front of the block, above the oil pan rail. The intake manifold is the definitive identifier, featuring three distinct Holley 2300 two-barrel carburetors with a unique progressive linkage (Chrysler Eng. Spec. ES-127B). The distributor is located at the rear of the intake manifold. Critical differentiation from the 440 Magnum: The Six-Pack uses a specific aluminum intake manifold (casting #2806937) and different cylinder heads (casting #2780915) with larger ports. All Six-Pack engines were built at the Trenton Engine Plant.
The 440 Six-Pack's primary reliability consideration is its age and the complexity of its triple-carburetor induction system. No factory service bulletins were issued for inherent flaws, as the engine was discontinued before reliability became a major industry focus. Modern operation requires addressing fuel system degradation, ignition wear, and sourcing correct high-octane fuel to prevent detonation.
Analysis derived from Chrysler factory service manuals (1969-1971) and SAE historical standards. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about CHRYSLER 440-SIX-PACK.
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 CHRYSLER 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.
CHRYSLER 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 officialCHRYSLER 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.
