1968 Ford Mustang Shelby Gt350 – Maintenance And Performance Guide
The 1968 Ford Mustang Shelby GT350 is a legendary American performance car that blends racing heritage with refined, street-legal drivability. This guide covers essential mechanical insights, maintenance best practices, and the technical considerations required to keep this classic icon running at its peak performance.
If you own a classic piece of American muscle, you understand that owning a piece of automotive history is both a privilege and a serious responsibility. The 1968 Ford Mustang Shelby GT350 is more than just a car; it is a high-performance machine that demands respect, careful maintenance, and a deep understanding of its unique mechanical DNA.
Many owners find themselves struggling to balance the desire for period-correct authenticity with the need for modern reliability. Whether you are prepping for a weekend cruise or a local car show, understanding the nuances of the 302 cubic-inch V8 engine and the specialized suspension geometry is critical for your safety and enjoyment.
In this article, we will break down the essential systems of this iconic vehicle. We will provide actionable advice on how to troubleshoot common issues and maintain the integrity of your classic muscle car for years to come.
Understanding the 1968 Ford Mustang Shelby GT350 Mechanical DNA
At the heart of the 1968 Ford Mustang Shelby GT350 lies the high-revving 302 cubic-inch small-block V8. Unlike the standard Mustang models of the era, the Shelby variant was engineered with specific intake and exhaust modifications that defined its distinct power delivery.
To keep this powerplant healthy, you must prioritize your fluid management. Modern engine oils often lack the zinc (ZDDP) levels required to protect the flat-tappet camshafts found in these vintage engines. Always use a high-quality oil additive or a specialized classic car motor oil to prevent premature lobe wear.
Ignition System Maintenance
The original points-style ignition system is a common point of failure for many owners. If you experience rough idling or intermittent misfires, start by inspecting the distributor cap, rotor, and the gap on your contact points.
- Check your dwell angle regularly to ensure proper spark duration.
- Consider upgrading to a pertronix electronic ignition conversion if you want modern reliability while keeping the engine bay looking period-correct.
- Always carry a spare set of spark plugs and a quality ignition coil in your trunk for roadside repairs.
Suspension Tuning and Handling Characteristics
The Shelby GT350 was famous for its aggressive handling, which was achieved through heavy-duty springs and stiffer sway bars. Because these components are now decades old, their rubber bushings are likely cracked or completely disintegrated.
Replacing worn bushings with polyurethane alternatives can significantly tighten your steering response. However, be aware that stiffer bushings will increase road vibration, which might impact your ride comfort on long trips.
Safety Checks for Classic Steering
Steering linkage play is a major safety concern for any vintage vehicle. Before hitting the road, check your tie rod ends, idler arm, and center link for excessive movement.
If you notice a “wandering” sensation at highway speeds, have a professional technician inspect your steering box. Adjusting the lash on a vintage Ford steering box is a delicate procedure that requires specific tools to prevent binding.
Fuel System Care for Modern Ethanol Blends
Modern pump gasoline often contains ethanol, which can wreak havoc on the fuel lines and carburetors of a 1968 Ford Mustang Shelby GT350. Ethanol is corrosive to older rubber hoses and can leave varnish deposits inside your carburetor bowls.
If your car sits for extended periods, the fuel can break down and cause significant starting issues. Always use a fuel stabilizer if you plan to store the vehicle for more than a few weeks.
Carburetor Tuning Tips
The Holley carburetor found on these engines requires periodic cleaning and tuning. If you notice a flat spot during acceleration, it may be time to rebuild the accelerator pump diaphragm.
Ensure your fuel filter is replaced annually to catch any sediment that may have accumulated in your fuel tank over the years. Using a high-quality inline glass or metal filter provides an extra layer of protection for your engine.
Optimizing Cooling for Peak Performance
Vintage muscle cars are notorious for cooling issues in modern traffic. The 1968 Ford Mustang Shelby GT350 requires an efficient cooling system to maintain optimal operating temperatures, especially during warm summer months.
If you are still running an original radiator, consider having it professionally boiled out or replaced with an aluminum unit. An aluminum radiator offers superior heat dissipation while maintaining a clean, professional appearance under the hood.
- Verify that your radiator fan shroud is installed correctly to pull air through the entire core.
- Use a high-quality coolant mix, but avoid using “extended life” coolants that may not be compatible with older gaskets and seals.
- Test your thermostat annually; a stuck thermostat is the most common cause of sudden overheating.
Common Pitfalls and Pro Maintenance Tips
One of the biggest mistakes owners make is ignoring the health of their braking system. The original single-reservoir master cylinder is a significant safety risk; if one line fails, you lose all braking power.
Upgrading to a dual-reservoir master cylinder is an essential safety modification. This simple change ensures that your front and rear brake circuits are independent, providing a backup system in the event of a leak.
When to Call a Professional
While DIY maintenance is rewarding, some tasks are best left to specialists. If you are dealing with internal engine noises, transmission rebuilds, or complex electrical gremlins, consult a shop that specializes in vintage Ford restorations.
Don’t hesitate to reach out to local Mustang clubs for recommendations. Experienced club members often have access to specialized tools and the “tribal knowledge” required to solve the most stubborn classic car issues.
Frequently Asked Questions About the 1968 Ford Mustang Shelby GT350
What is the best way to prevent rust on a 1968 Shelby GT350?
Rust prevention starts with keeping the car in a climate-controlled environment. Regularly inspect the floor pans, rocker panels, and cowl area for debris, as trapped leaves and moisture are the primary culprits for hidden corrosion.
Can I use unleaded fuel in my original engine?
Yes, you can use modern unleaded fuel, but ensure your ignition timing is set correctly to avoid engine “pinging” or detonation. If you find the engine runs poorly, you may need to install hardened valve seats during your next head rebuild.
How often should I change the transmission fluid?
For a vehicle that sees occasional weekend use, change the manual or automatic transmission fluid every two years or 5,000 miles. This prevents the buildup of clutch material and ensures smooth gear engagement.
Is it difficult to find replacement parts for this model?
Because the Mustang platform was so popular, many mechanical parts are still widely available through specialized vintage parts suppliers. However, specific Shelby-unique trim pieces can be expensive and may require searching through dedicated collector networks.
Owning and maintaining this classic icon is a journey that rewards patience and attention to detail. By following these maintenance steps and respecting the mechanical needs of your vehicle, you ensure that your 1968 Ford Mustang Shelby GT350 remains a show-stopper for years to come. Stay diligent, keep your tools organized, and enjoy every mile behind the wheel!
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