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 Plym…
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 | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 670 lbs (304 kg) |
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.
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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.
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In its original era, the 440 Six-Pack was renowned for its brute strength and durability. Long-term reliability today depends entirely on meticulous maintenance, correct tuning of the complex triple-carb setup, and using compatible modern fuels and components. With proper care, these engines can run reliably for decades.
The most common issues stem from its age and complexity: keeping the three carburetors perfectly synchronized, degradation of fuel system components by modern ethanol-blended gasoline, wear in the original ignition system, and cooling system inefficiencies. These are well-documented in factory service manuals.
The 440 Six-Pack was a factory option for the Dodge Challenger R/T (1970-1971) and the Plymouth Road Runner and GTX (1969-1971). It was never installed in a Chrysler-badged vehicle. It was identified by the 'A12' option code on Dodge and the 'Six-Barrel' option on Plymouth.
Absolutely. The 440 Six-Pack is a legendary platform for performance upgrades. Common modifications include higher-lift camshafts, improved cylinder heads, headers, and upgrading to a modern four-barrel carburetor or fuel injection. Many examples exceed 500+ horsepower while retaining streetability.
Fuel economy is very poor by modern standards. Expect 8-12 mpg (city) and 12-15 mpg (highway), or roughly 29.4 L/100km combined. This is typical for a large-displacement, high-compression V8 with triple carburetors from the muscle car era.
No. Like virtually all American pushrod V8 engines of its era, the Chrysler 440 is a non-interference engine. If the timing chain were to fail, the pistons and valves would not collide, preventing catastrophic internal engine damage.
Originally, non-detergent SAE 10W-40 was specified. For modern operation, a high-quality 10W-40 or 20W-50 oil with high ZDDP (zinc) content is essential to protect the flat-tappet camshaft and lifters from premature wear. Modern 'muscle car' or 'classic' oils are formulated for this purpose.
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