The Chevy 350 uses a spin-on oil filter that threads onto the engine block, and the most common replacement is the AC Delco PF52 or its modern equivalent, the PF63

The Chevy 350 engine — built from 1967 through the early 2000s and still found in many trucks, cars, and marine applications — takes a standard threaded spin-on filter. The filter screws directly onto a boss (a threaded post) on the engine's side, near the oil pan. When you turn the wrench, you are tightening or loosening this one filter, not swapping multiple cartridges or dealing with a canister system.

AC Delco, the General Motors parts division, made the original filters for the 350. The PF52 was the long-standing choice for decades. Today, AC Delco still makes filters for the 350, but the part numbers have shifted slightly depending on the year of your engine and what you are doing — whether you are rebuilding, maintaining an original, or swapping a 350 into a different vehicle. Aftermarket brands like Fram, Motorcraft, and Bosch also make filters that fit the 350's thread size and flow rate.

Key Takeaways

  • The Chevy 350 uses a spin-on filter that threads directly onto the engine block, not a cartridge or canister design.
  • AC Delco PF52 and PF63 are the original equipment filters; many aftermarket brands fit the same thread and flow specifications.
  • Filter size and thread pitch are standardized, so any filter rated for the 350's displacement and oil flow will work, but checking your owner's manual or the engine's original filter ensures you get the right one.
  • The filter location on the 350 is on the side of the engine block, making it accessible without removing other components in most installations.

How to Identify the Right Filter for Your 350

The easiest way to know which filter fits your 350 is to look at what is already on the engine. Spin-on filters have the thread size and flow rating printed or stamped on the canister. If your 350 is original to the vehicle, the owner's manual will list the filter part number. If you are working on a 350 that has been in storage or swapped into a different vehicle, you can cross-reference the old filter's part number online or call a parts counter with the engine year and displacement.

Most Chevy 350 engines use a filter with a 3/4-inch-16 thread (meaning 3/4 inch in diameter, 16 threads per inch). This is a common size, so many filters will physically screw on. However, the flow rate — how much oil the filter can pass per minute — matters. A 350 typically needs a filter rated for around 60 to 80 gallons per minute at idle. Using a filter rated for much higher flow can let unfiltered oil bypass the element; using one rated too low can restrict oil pressure. The filter canister always lists the flow rating, usually in small print.

AC Delco, Fram, and Other Common Brands

AC Delco PF52 was the factory filter for most 350 engines built before the 1990s. AC Delco PF63 is the modern replacement and fits the same thread. Both are spin-on, both fit the 350's oil flow needs, and both are still sold at dealerships and parts stores. If you want the exact original part, AC Delco is the choice.

Fram PH8A and Fram PH3600 are two Fram filters that fit the 350; Motorcraft FL-1A fits Ford 351 engines but also works on a 350 if you need it in a pinch. Bosch 3323 is another option. All of these are widely available and cost less than AC Delco in most cases. The trade-off is that AC Delco is made by General Motors and engineered specifically for GM engines, while aftermarket filters are engineered to meet the same performance standard but may use different media or bypass valve designs.

None of these differences matter much for routine oil changes. What matters is that the filter you buy has the right thread size (3/4-16 for the 350), the right flow rating (60–80 GPM for the 350), and that you replace it on schedule — typically every 3,000 to 5,000 miles for conventional oil, or every 7,500 to 10,000 miles for synthetic, depending on your oil choice and driving conditions.

Where the Filter Sits on the 350

On a Chevy 350, the oil filter mounts on the right side of the engine block (the passenger side if the engine is in a car or truck). The filter head — the threaded boss where the filter screws on — is usually located below the cylinder head and above the oil pan, making it accessible without removing the intake manifold or other major components.

In some installations, especially in tight engine bays or when the 350 is swapped into a vehicle it was not originally designed for, the filter can be hard to reach. You may need a filter wrench with a long handle or a swivel-socket setup to turn it. If the filter is truly inaccessible, some builders use a remote filter mount — a bracket that relocates the filter to a more convenient spot — but this is uncommon for stock 350 installations.

Spin-On Filters vs. Other Filter Types

The Chevy 350 uses a spin-on filter, which means the entire filter element and canister are one unit that you unscrew and replace. You do not remove a cartridge from a housing or clean a reusable screen. This design is straightforward, fast, and standard on most American V8 engines from the 1960s onward.

Some older engines use cartridge filters, where you unscrew a cap, pull out the pleated paper element, and replace just the element. Some high-performance or marine 350s use dual filters or remote filter setups, but these are modifications, not factory designs. If your 350 came with a spin-on filter, stick with a spin-on replacement — it is what the engine was designed for.

Checking Your Owner's Manual or Service Records

If you own the vehicle and have the manual, look in the maintenance section for the filter part number. Chevy manuals list the filter by AC Delco part number and sometimes by Fram or other aftermarket equivalents. If you have old service records from a dealership or independent shop, they often note which filter was installed and when.

If you do not have the manual or records, you can call a Chevy dealership parts department with your vehicle's year, make, model, and engine size (350 cubic inches or 5.7 liters). They will give you the correct part number in seconds. You can also take a photo of the old filter and bring it to an auto parts store; the staff can cross-reference it and confirm the replacement.

Frequently Asked Questions

Can I use any spin-on filter on my 350, or does it have to be AC Delco?

Any spin-on filter with a 3/4-inch-16 thread and a flow rating of 60–80 GPM will work. AC Delco is the original equipment choice and is made by General Motors, but Fram, Motorcraft, Bosch, and other brands meet the same performance standard. Choose based on price, availability, and your preference for brand.

What happens if I use the wrong filter size?

If the thread size is wrong, the filter will not screw on at all. If the flow rating is too low, oil pressure may drop at idle. If it is too high, unfiltered oil can bypass the element. Always check the canister for the thread size and flow rating before buying.

How often should I change the oil filter on a 350?

Change the filter every time you change the oil. For conventional oil, that is typically every 3,000 to 5,000 miles. For synthetic oil, it is usually every 7,500 to 10,000 miles. Check your owner's manual or the oil bottle for the recommended interval.

Is the filter location the same on all 350 engines?

The filter mounts on the right side of the block on most 350s, but the exact location can vary slightly depending on the year and whether the engine is in its original vehicle or has been swapped. If you cannot find it, check the owner's manual or ask at a parts counter with your specific year and process.

Can I use a 350 filter on a different Chevy engine?

Not necessarily. Different engines have different thread sizes and flow ratings. A 350 filter is designed for the 350's oil flow and pressure. Using it on a smaller or larger engine could cause pressure problems. Always match the filter to the engine you are working on.