GM Ram Jet 350: Modern Fuel Injection Power

For enthusiasts of classic automobiles, the desire to blend the timeless aesthetics and heritage of older vehicles with the reliability and performance of modern technology has given rise to a popular trend known as 'restification'. This ingenious approach allows car owners to enjoy the best of both worlds, and at the heart of many such projects lies a critical question: how to achieve contemporary power delivery without sacrificing the classic feel? One particular engine frequently comes into sharp focus when discussing this blend of old and new: the GM Ram Jet 350. A common query among those considering this formidable powerplant is whether it incorporates a modern fuel injection system. The answer is a resounding yes, and it’s a feature that truly sets this crate engine apart.

The GM Ram Jet 350 is not merely a re-release of an old design; it's a meticulously engineered package that brings state-of-the-art port fuel injection to a classic small-block V-8. While GM did offer early iterations of Ram Jet fuel injection on various models from the late 1950s through the mid-1960s, the system in the Ram Jet 350 crate engine is a vastly more sophisticated and aesthetically pleasing rendition. It represents the pinnacle of modern electronic fuel delivery adapted for a beloved, traditional engine architecture, making it an ideal choice for anyone looking to infuse their vintage ride with contemporary drivability and efficiency.

The Heart of the Beast: Port Fuel Injection Explained

At the core of the Ram Jet 350's impressive performance and modern manners is its advanced, electronically controlled port fuel injection system. Unlike older carburettor setups, which rely on mechanical means to mix air and fuel, port fuel injection delivers fuel directly into the intake port of each cylinder, just before the intake valve. This precision allows for much finer control over the air-fuel mixture, leading to several significant advantages:

• Exceptional Throttle Response: Fuel is delivered precisely when needed, resulting in immediate and smooth acceleration.
• Improved Fuel Economy: The precise control minimises fuel waste, leading to better mileage compared to carburettors.
• Reliable Cold Starts: Electronic control ensures the correct fuel mixture for easy starting in all temperatures.
• Reduced Emissions: A more efficient burn reduces harmful pollutants, which can be crucial for modern vehicle inspections.
• Consistent Performance: Unlike carburettors, which can be sensitive to altitude and temperature changes, fuel injection maintains optimal performance across varying conditions.

The stylish intake plenum, a distinctive visual element of the Ram Jet 350, isn't just for show; it's designed to efficiently feed air to this sophisticated fuel injection system. The entire system has been developed by GM to the same rigorous standards as production vehicle engines, ensuring reliability and long-term performance.

The Brains Behind the Brawn: The MEFI 4 Controller

Powering this advanced fuel injection system is the sophisticated, latest-generation MEFI 4 controller. This electronic control unit (ECU) is the 'brain' of the engine management system, orchestrating fuel delivery and ignition timing with incredible precision. The MEFI 4 boasts improved electronics and crucial closed-loop capability, a significant upgrade over the previous MEFI 3 system. Closed-loop operation means the system constantly monitors engine parameters, such as oxygen levels in the exhaust, and makes real-time adjustments to the fuel mixture for optimal performance and efficiency. This constant feedback loop ensures great all-around drivability, whether you're cruising on the motorway or navigating city streets.

Beyond the Basics: Engineering Excellence and Durability

While the fuel injection system is a major highlight, the Ram Jet 350 is built upon a foundation of proven GM engineering. Anchoring this modern marvel is a venerable 350 cubic inch small-block V-8 combination, renowned for its robustness and adaptability. This engine is designed for long-lasting durability and is engineered for compatibility with readily available pump-gas, typically requiring 92 octane fuel.

Key components that contribute to its reliability and performance include:

• Vortec Cylinder Heads: These Vortec cylinder heads (Part Number 12558060) are a hallmark of GM's modern small-block design, known for their excellent airflow characteristics, which significantly contribute to the engine's power output and efficiency. With 64cc chambers and valve sizes of 1.94 inches for intake and 1.50 inches for exhaust, they are optimised for performance.
• Hydraulic Roller Camshaft: The hydraulic roller camshaft (Part Number 14097395) contributes to the engine's smooth operation and efficiency while reducing internal friction compared to flat-tappet designs. It features a lift of .431 inches for intake and .451 inches for exhaust, with durations of 196 degrees intake and 206 degrees exhaust at .050 inches.
• 9.4:1 Compression Ratio: This moderate compression ratio is carefully chosen to provide a good balance of power and pump-gas compatibility, preventing detonation and ensuring longevity.
• Robust Internal Components: The engine features a cast-iron block with 2-bolt main caps, a cast-iron crankshaft (P/N 10243068), powdered metal steel connecting rods (P/N 10108688), and hypereutectic aluminum pistons (P/N 88894280). These components are selected for their strength and durability, ensuring the engine can handle the demands of enthusiastic driving.
• Aluminium Roller Style Rocker Arms: With a 1.6:1 ratio (P/N 12367346), these rocker arms contribute to the valvetrain's efficiency and durability.

Bringing a Classic to Life: Applications and Installation Insights

The Ram Jet 350 crate engine (Part Number: 12499120) comes complete with the necessary wiring harness and detailed instructions, making the conversion process as straightforward as possible for skilled mechanics and dedicated enthusiasts. It is specifically designed to be installed on any 1976-or-earlier vehicle originally equipped with a carburettor, making it a perfect upgrade for a wide range of classic cars and hot rods.

Possible applications range from updating a classic Stingray to providing that 'something extra' under the bonnet of any hot rod, ensuring it becomes a conversation starter at any car meet. However, it's important to note that these are suggestions, and installers must verify local emissions regulations and specific vehicle compatibility. The engine is intended for pre-1977 street vehicles or all off-road vehicles and is not designed for marine use.

Critical Installation Notes:

• Distributor Compatibility: A distributor with a melonized steel gear MUST be used with this engine. Using an incompatible gear can lead to severe engine damage due to the steel camshaft.
• Flywheel/Flexplate: The engine typically comes with an externally balanced, manual transmission flywheel. If you are fitting an automatic transmission, you will need to change to an externally balanced flexplate.
• External Supplies: The installer is responsible for supplying a 12-volt power source and an appropriate fuel pump. Refer to the detailed instructions for fuel pump recommendations to ensure correct fuel pressure and flow for the fuel injection system.

Ram Jet 350 Tech Specs: A Closer Look

Understanding the technical specifications of the Ram Jet 350 provides further insight into its capabilities and design:

The Critical Break-In Procedure

For a safe, proper, and trouble-free engine break-in, the MEFI 4 computer incorporates a special 'green' mode that meticulously controls the engine's RPM during the initial running period. This feature is paramount for ensuring the longevity and optimal performance of your new engine. The break-in procedure is carefully staged:

• First Hour: From start-up to the end of the first hour, the maximum RPM is limited to 4000 rpm.
• Second Hour: During the second hour of operation, the maximum RPM increases to 4500 rpm.
• Third Hour and Beyond: For the third hour and onwards, the engine can be run up to its maximum recommended RPM of 5500 rpm.

Strictly adhering to this break-in protocol is vital. It allows the internal components, particularly the camshaft and lifters, to properly seat and wear in, preventing premature wear and ensuring the engine delivers its intended performance and durability throughout its lifespan.

Frequently Asked Questions (FAQs)

What does 'restification' mean in the context of the Ram Jet 350?

'Restification' is the process of restoring a classic vehicle while simultaneously incorporating modern technologies, such as advanced fuel injection and electronic controls, to enhance its performance, reliability, and drivability without compromising its vintage aesthetic. The Ram Jet 350 is a prime example of an engine designed specifically for this purpose.

Is the Ram Jet 350 a direct bolt-in for any classic car?

While it is designed for ease of installation, it's specifically intended for 1976-or-earlier vehicles that were originally equipped with a carburettor. Some modifications or additional components (like a specific fuel pump or a different flexplate for automatic transmissions) may be required. Always consult the detailed installation instructions and local regulations.

What type of fuel does the Ram Jet 350 require?

The engine is designed for compatibility with readily available pump-gas, with 92 octane being the recommended fuel for optimal performance and to prevent detonation.

Can I use this engine with an automatic transmission?

Yes, the Ram Jet 350 can be used with an automatic transmission. However, it typically comes with an externally balanced manual transmission flywheel. For automatic transmission applications, you will need to replace this with an externally balanced flexplate.

What makes the MEFI 4 controller so advanced?

The MEFI 4 controller is the latest generation of GM's Marine Electronic Fuel Injection system, adapted for automotive use. Its advancements include improved electronics for faster processing and more precise control, as well as crucial closed-loop capability. Closed-loop means it constantly monitors engine performance via sensors (like oxygen sensors) and makes real-time adjustments to the fuel and ignition, ensuring optimal efficiency, emissions, and drivability across all operating conditions.

Are there any specific parts I need to buy for installation that aren't included?

Yes, the installer will need to supply a 12-volt power source for the engine's electrical system and a suitable electric fuel pump. Crucially, a distributor with a melonized steel gear must be used to prevent damage to the steel camshaft.

What is the purpose of the break-in procedure?

The break-in procedure, controlled by the MEFI 4 computer's 'green' mode, is vital for the long-term health and performance of the engine. It ensures that critical internal components, particularly the camshaft and lifters, properly seat and wear in under controlled RPM limits. This controlled initial running period helps prevent premature wear and ensures the engine achieves its designed lifespan and performance capabilities.

Conclusion

The GM Ram Jet 350 crate engine is a testament to the seamless integration of classic design and modern engineering. Its state-of-the-art port fuel injection system, managed by the intelligent MEFI 4 controller, directly addresses the demands of contemporary driving, offering superior throttle response, fuel efficiency, and reliability compared to traditional carburettor setups. Far from being a simple re-hash, this engine offers a compelling solution for the discerning enthusiast seeking to 'restify' their beloved classic, providing a dependable, powerful, and efficient heart that truly brings the best of the old and new together. Whether you're aiming to update a vintage sports car or build a show-stopping hot rod, the Ram Jet 350 stands as a formidable choice, ensuring your classic ride performs with the vigour and precision of a modern vehicle.

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