The FRAM PH8A oil filter is a familiar name for many classic and older American vehicle owners. With its sturdy spin-on design, 3/4″-16 thread size, and robust canister, this filter remains a go-to for a range of Ford, AMC/Jeep, and select Chrysler engines.
If you’re working with a vehicle from the 1960s through the 1990s, chances are the PH8A, or its equivalents have a place under the hood.
Let’s break down its primary applications and why it is a trusted option for enthusiasts and owners alike.
1. Primary Ford Usage
Small-Block V8 Applications
The FRAM PH8A is most prominent in Ford’s small-block V8 engines. Classic powerplants such as the 289, 302 (5.0L), and 351 Windsor or Cleveland have widely used this filter for decades.
From 1960s Mustangs to 1990s Broncos and F-Series pickups, this filter provided reliable performance for generations of Ford vehicles.
Even Ford’s larger big-block engines, like the 400 and 460 V8s, frequently called for the PH8A or its equivalent, making it a staple for full-size trucks and sedans of the era.
Cross-Reference to Motorcraft FL-1A
The FRAM PH8A is often cross-referenced with Ford’s original Motorcraft FL-1A filter. Both filters share similar specifications and compatibility across a wide range of Ford engines, ensuring seamless interchangeability.
Ford Trucks and Vans
Older F-Series trucks (F-100, F-150, and beyond) and E-Series vans featuring gasoline V8 engines frequently relied on this filter. From workhorse pickups to utility vans, the PH8A efficiently handled the oil filtration needs of heavy-duty applications.
2. AMC/Jeep Applications
The FRAM PH8A oil filter also fits a range of older AMC and Jeep engines, making it a popular choice for enthusiasts who own these durable, legacy vehicles. Let’s break it down.
Jeep Inline-6 Engines
Many Jeep owners of earlier models will find the PH8A compatible with the renowned 4.0L and 4.2L inline-6 engines, a hallmark of Jeep reliability.
These engines powered iconic vehicles like the Jeep Wrangler (YJ), Cherokee (XJ), and Grand Wagoneer, often lasting well beyond expectations with proper maintenance.
The PH8A’s thread size and gasket diameter align perfectly with the oil filter mounts on these engines, ensuring an easy, secure fit.
AMC V8 Engines
For classic AMC enthusiasts, the PH8A finds its place in V8 setups, including the 304, 360, and 401 cubic-inch engines.
These powerhouses were staples in many older Jeeps and AMC passenger cars. The PH8A works well if the engine bay provides enough clearance for the larger canister design, ensuring smooth oil flow and efficient filtration.
Why It’s a Great Fit for AMC/Jeep
The PH8A provides a reliable and easy-to-find option for older vehicles, which can sometimes present challenges when sourcing parts.
Its durable construction, wide availability, and compatibility with classic American engines make it a dependable choice for Jeep and AMC owners keeping these iconic vehicles on the road.
3. Select Mopar (Chrysler) Engines
The FRAM PH8A also finds its place in some older Mopar engines, particularly V8s from Dodge and Chrysler, though its compatibility depends on the specific model and engine configuration. This filter has been a trusted option for Mopar fans looking to maintain their classic setups.
Older Chrysler Small-Block V8s
For Mopar small-block engines like the LA 318 and 360, the PH8A can often be a viable fit, provided there’s adequate clearance for the larger canister design.
While some configurations default to shorter oil filters, the PH8A offers increased oil capacity and filtration surface, ideal for engines that run hotter or are used in heavy-duty applications.
Clearance Considerations
In some cases, the PH8A may be substituted for filters like the shorter PH16, but only if there’s room for its taller profile. Engine compartments in older trucks or larger vehicles generally offer enough space, but tighter bays might require alternative options.
Why Mopar Owners Choose the PH8A
The PH8A’s compatibility with older Mopar engines provides a reliable filtration solution, especially for vehicles that have seen years of service. Its availability and capacity make it a practical choice for those maintaining the heritage of Chrysler’s small-block designs.
4. Technical Considerations
When choosing the right oil filter, it’s essential to understand the technical details that make the FRAM PH8A a popular choice. This section breaks down the specifications and design features contributing to its compatibility and performance in older engines.
Thread and Gasket Specifications
The FRAM PH8A features a 3/4″-16 thread pitch and a gasket diameter of approximately 2.8 inches. These dimensions align with many older American engines, making the filter a near-universal option for classic Ford, AMC, and Chrysler vehicles. Its reliable sealing surface ensures oil stays where it should while preventing leaks.
Filter Height and Clearance
One defining characteristic of the PH8A is its relatively tall canister design. This extra length increases oil filtration capacity, particularly beneficial for larger engines or those used in demanding conditions.
However, the taller design requires sufficient vertical clearance in the engine bay. Shorter alternatives, like the FRAM PH16, may be necessary in vehicles with tighter spaces.
Filtration Capacity
The PH8A’s internal structure balances filtration efficiency with proper oil flow. It’s designed to effectively capture debris while maintaining smooth oil circulation, a critical factor for older engines that may produce more contaminants over time. This makes it an excellent option for vehicles with high mileage or those driven in harsh conditions.
✔ Up to 10,000 Miles of Protection – Designed for long-lasting performance with conventional or synthetic motor oils.
✔ Advanced Filtration Media – Cellulose and glass fiber blend captures up to 95% of harmful dirt particles, protecting your engine from wear.
✔ Reliable Engine Protection – Proprietary filter media and silicone anti-drain back valve help maintain consistent oil flow and engine longevity.
✔ Easy Installation & Removal – Features a SureGrip non-slip surface for quick, hassle-free filter changes.
✔ Ideal for Routine Maintenance – Built for everyday drivers who keep up with regular oil change intervals.
5. Benefits and Limitations
The FRAM PH8A has stood the test of time, offering reliable filtration for classic engines. However, like any component, it has advantages and a few considerations.
Benefits
One key reason for the PH8A’s popularity is its compatibility with older Ford, AMC, and select Chrysler engines.
Its larger capacity provides ample filtration, particularly helpful for vehicles with older designs or those running longer intervals between oil changes.
Moreover, its proven design aligns with decades of automotive engineering, ensuring it performs consistently under various conditions.
Another notable advantage is its availability. The PH8A is widely stocked and easy to source, making it a convenient choice for owners of vintage or classic vehicles.
Its design also mirrors the specifications of popular filters like the Motorcraft FL-1A, giving users the flexibility to switch without sacrificing performance.
Limitations
The tall canister design, while advantageous for capacity, can pose clearance challenges in engine bays with limited space.
This is especially true for vehicles modified with non-stock components or those that have undergone engine swaps. In such cases, a shorter alternative might be more practical.
Additionally, the filter media and bypass valve in the standard PH8A may not meet the demands of high-performance applications or heavy-duty use.
While it’s an excellent choice for general driving, enthusiasts and off-roaders often opt for premium versions with enhanced filtration or more robust bypass pressure ratings.
6. Typical Vehicles Using the FRAM PH8A
The FRAM PH8A has found its place in various vehicles, particularly those with classic American engines. Here’s a closer look at the most common models where this filter fits like a glove.
Ford Classics and Workhorses
Ford enthusiasts will recognize the PH8A as a go-to choice for classic Mustangs, particularly those powered by small-block V8 engines like the 289, 302, and 351 Windsor.
It also serves the Ford Bronco and F-Series trucks (F-100, F-150, F-250) from the 1970s to the early 1990s. With their sturdy engines and spacious engine bays, these vehicles are perfect matches for the larger filter.
AMC/Jeep Reliability
In the Jeep world, the PH8A is often found in Wranglers (YJ) and Cherokees (XJ) with robust 4.0L and 4.2L inline-six engines.
It’s also compatible with AMC V8 powerplants like the 304, 360, and 401, which powered Grand Wagoneers and other AMC classics. These engines, known for their durability, benefit from the PH8A’s filtration capacity and flow rate.
Possible Mopar Fits
For older Chrysler V8s, including some 318 and 360 engines, the PH8A is an option—provided there’s enough room in the engine bay.
It’s always a good idea to double-check clearance and sealing before using it on Mopar applications, as some setups may favor shorter alternatives.
Final Thoughts
The FRAM PH8A is a dependable choice for many classic American vehicles. Whether you’re maintaining a vintage Ford Mustang, tackling trails in a Jeep Cherokee, or restoring an old F-Series truck, this filter has proven its worth with robust design and widespread compatibility.
Its ability to handle larger engines and offer reliable filtration makes it a favorite among car enthusiasts and mechanics.
That said, always verify your vehicle’s exact fitment needs before installation. While the PH8A fits many applications, proper clearance and compatibility with your engine’s specifications are key to ensuring optimal performance.
When in doubt, double-check your vehicle’s owner’s manual or official parts guide to confirm fitment. A little diligence goes a long way in keeping your engine running smoothly.
Was This Article Helpful?
Rami Hasan is the founder of CherishYourCar.com, where he combines his web publishing experience with a passion for the automotive world. He’s committed to creating clear, practical guides that help drivers take better care of their vehicles and get more out of every mile.