Holden FJ/FC, Frequently Asked Questions

What is the Grey Motor?

The Grey Motor is Holden’s original engine, a 132.5 cubic inch (2,171 cc) flathead inline-six that powered every Holden from the 48-215 in 1948 through to the FC in 1960. It’s called the “Grey Motor” because of the grey paint on the block (though some were painted green in later production). It’s a sidevalve (flathead) design, meaning the valves sit in the block beside the cylinders rather than in the head. This makes it mechanically simple, no pushrods, no rocker arms, no complex valve train. The trade-off is limited breathing and therefore limited power output. The FJ’s Grey Motor produces approximately 45 horsepower at 3,800 rpm. The FC received a revised head and carburettor, bumping output to around 52 hp. Neither version will win drag races, but both are phenomenally reliable and easy to work on.

What’s the difference between an FJ and an FC?

The FJ (1953-1956) and FC (1958-1960) share the same basic platform and Grey Motor engine, but the FC is a meaningfully improved car. The FC has a wider body with more interior space, revised front suspension with better handling, improved brakes, a slightly more powerful version of the Grey Motor (52 hp vs 45 hp), and a more contemporary appearance. The FC also introduced the panel van and station sedan body styles.

The FJ is the more valuable car due to its iconic status and cultural significance, it was only the second Holden ever made and became a national symbol. The FC is the better car to drive. If you want an investment or a show piece, buy an FJ. If you want to actually use and enjoy the car, buy an FC.

Can I still get parts for an FJ/FC?

Yes, though the supply chain requires more effort than for newer classics. Mechanical parts for the Grey Motor, gaskets, bearings, seals, valve components, ignition parts, brake components, are still manufactured by specialists like Rare Spares and Restoration Industries. Body panels are the bigger challenge. Reproduction panels (guards, floor pans, sill sections) are available but supply is intermittent and prices are significant. Original NOS (new old stock) panels are essentially extinct. Good secondhand panels from dry-climate cars are the best source, buy them when you find them. FJ/FC owners’ clubs maintain parts registries and trading networks that are invaluable for sourcing hard-to-find items.

Can I run an FJ/FC on unleaded fuel?

Yes, with a caveat. The Grey Motor was designed for leaded fuel, and the lead provided a cushion for the valve seats. Running on unleaded fuel without modification will eventually cause valve seat recession, the valves gradually wear into the softer cast-iron seats. The solution is either to add a lead replacement additive (Valvemaster or similar) to every tank, or to have the block machined to accept hardened valve seat inserts. If you’re driving the car regularly, the insert modification is the better long-term solution ($800-1,500 at a machine shop). If you only drive occasionally, the additive is adequate.

How fast is an FJ/FC?

Not fast. The FJ with its 45 hp Grey Motor has a top speed of approximately 120 km/h (75 mph) and takes around 25 seconds to reach 100 km/h. The FC is marginally quicker with its 52 hp engine, top speed around 130 km/h and 0-100 in approximately 22 seconds. These are not performance figures by any modern standard. The FJ/FC is a car you cruise in, not one you hurry in. At 80-90 km/h on a country road, the Grey Motor is in its element, unstressed, relaxed, and utterly content. Trying to keep up with modern traffic on a freeway is unpleasant and mechanically hard on the car.

Are FJ/FC Holdens safe to drive on modern roads?

They’re safe in the context of 1950s engineering, which means they lack every safety feature you take for granted in a modern car. There are no seat belts (unless retrofitted), no crumple zones, no airbags, no ABS, no electronic stability control, and the drum brakes require significantly more stopping distance than modern disc brakes. The steering is slow and imprecise by modern standards.

That said, thousands of Australians drive FJ and FC Holdens on public roads every weekend without incident. The key is to drive the car within its limits, leave more following distance, anticipate stops earlier, avoid high-speed freeway driving, and never forget that you’re in a 70-year-old vehicle. Retrofitting seatbelts is strongly recommended and can be done without visible modification to the interior.

Should I restore an FJ or buy one already done?

It depends on your skills, budget, and patience. A ground-up restoration of an FJ from a rusty project car will cost $40,000-80,000 in parts and professional labour, take 2-5 years, and test your resolve. Many restorations stall halfway through when the owner underestimates the cost and time involved. Buying a car that’s already been professionally restored, while more expensive upfront, guarantees a finished result and lets you enjoy the car immediately.

If you enjoy the restoration process itself, a project FJ at $10,000-20,000 can be deeply rewarding. Join a club first. Find a mentor who’s done the job. Get the body assessed by a professional before you commit, the bodywork is the most expensive and time-consuming part of any FJ/FC restoration.

If you want to drive the car rather than build it, buy the best example you can afford and enjoy it from day one.

What’s an FJ worth?

In 2026, FJ values span a wide range. A non-running project with a solid body might fetch $10,000-20,000. A running, presentable driver-quality car is $35,000-55,000. A well-restored example in excellent condition is $55,000-80,000. A concours-quality restoration with correct details and documented history can exceed $100,000. The FJ Special sedan is the most valuable variant, followed by the ute and panel van. The Standard sedan is the most affordable. Manual cars are more valuable than automatics (the Powerglide auto was only available on the FC).

What’s an FC worth?

The FC is more affordable than the FJ across the board. Project cars start at $5,000-12,000. Drivers are $15,000-30,000. Good restored examples are $30,000-50,000. Excellent cars with full restoration can reach $50,000-70,000. The FC utility and panel van are desirable in their own right and command similar prices to the sedan.

Can I upgrade the Grey Motor for more power?

You can, but don’t expect miracles. The flathead design has inherent airflow limitations. Common upgrades include: a performance exhaust manifold (the stock manifold is very restrictive), a Weber carburettor conversion (better atomisation and throttle response), a hotter camshaft (limited options exist), and balancing the bottom end. These modifications together might add 10-15 hp, taking the engine from 45 hp to perhaps 60 hp. That’s a 30% improvement, which is noticeable, but the car is still going to be slow by any modern standard.

Some owners have fitted later Holden engines (the 186ci or 202ci Red Motor from the EH-HZ era) into FJ/FC bodies. This is a significant modification that requires engine mounts, gearbox adaptation, driveshaft changes, and usually a radiator upgrade. It transforms the car’s performance, the 202 produces 100+ hp in mild tune, but it’s no longer an original Grey Motor car, which affects authenticity and potentially value.

Is the FJ/FC unibody or body-on-frame?

Unibody (monocoque). The FJ and FC use a welded steel body that serves as both the chassis and the body structure. There is no separate frame underneath. This is why floor pan and sill rust is so critical, when these structural elements rust through, the car loses rigidity and becomes unsafe. It also means that body restoration requires working with the structural elements, not just cosmetic panels.

What oil should I use in the Grey Motor?

Use 30W or 20W-50 mineral oil. The Grey Motor has generous clearances and was designed for the thick mineral oils available in the 1950s. Do not use modern thin synthetic oils, they can leak past old seals and don’t provide the same film strength in the Grey Motor’s bearing clearances. Mineral oil from Penrite, Castrol Classic, or Valvoline VR1 is ideal. Change the oil every 3,000-5,000 km. The Grey Motor has no oil filter from the factory (some cars have had one retrofitted), without a filter, regular oil changes are essential.

What clubs should I join?

The FJ Holden Car Club and the FC Holden Car Club are the primary marque-specific clubs, with chapters in most states. The Holden Car Club of Australia (HCCA) covers all Holden models and is another excellent resource. Club membership provides access to technical expertise, parts trading networks, club events, and, critically, eligibility for club registration (conditional registration), which is significantly cheaper than full registration for a car you drive on weekends and to events.

Can I daily-drive an FJ/FC?

Technically yes, but realistically it’s not advisable. The brakes are inadequate for modern traffic. The lack of seatbelts (unless retrofitted) is a safety concern. The engine overheats in sustained stop-start traffic. The electrical system is marginal for running headlights, indicators, and wipers simultaneously in the rain. Finding parking for a vehicle you’re terrified of door dings on is stressful.

These cars are best enjoyed as weekend and event vehicles. Club registration (available in most states) is designed exactly for this use case, limited-mileage registration at a fraction of the cost of full rego. Drive the FJ/FC on sunny weekends, to car shows, and on country road tours where it belongs.

What should I look for when inspecting a car?

The body is everything. Check the floor pans, sills, A-pillars, lower guards, boot floor, and firewall for rust. Use a magnet to check for body filler, if the magnet doesn’t stick to a panel, there’s filler hiding something. Crawl under the car with a torch and a screwdriver. The mechanical components, engine, gearbox, suspension, are all rebuildable for reasonable money. The body is what makes or breaks the deal. A car with a solid body and a tired engine is a good buy. A car with a fresh engine and a rotting body is a money pit.

Are left-hand-drive FJ/FC cars available?

Yes. Holden exported FJs and FCs to various markets, including left-hand-drive versions for some export destinations. These are rare in Australia and are not as desirable as Australian-delivered right-hand-drive cars for the domestic collector market. However, they’re sought after by overseas collectors, particularly in the United States and Europe, where the FJ has a following as an unusual and characterful 1950s classic.

What tyres should I use?

The original tyre size for the FJ is 5.90-15 crossply. For the FC, the size is 6.40-15 or 6.70-15. Crossply tyres in these sizes are still available from tyre specialists but are becoming expensive and uncommon. Most owners run radial tyres in the closest available size (typically 185/80R15 or 195/75R15), which provide dramatically better grip, handling, and tyre life compared to crossplies. Radials on an FJ/FC are not period-correct for concours judging, but they make the car significantly safer and more pleasant to drive. For a car you intend to show, keep a set of crossplies for display and radials for driving.

Will FJ/FC values keep going up?

Almost certainly, yes. The FJ in particular is a blue-chip Australian classic. Its cultural significance, combined with a finite and shrinking supply of surviving cars, ensures sustained demand. The FJ appeals not just to car enthusiasts but to a broader market of people who want to own a piece of Australian history. As the generation that grew up with FJ Holdens reaches retirement and has disposable income to spend on nostalgia, demand will remain strong.

The FC is likely to follow the same trajectory with a 5-10 year lag. As FJ prices climb beyond many buyers’ reach, the FC becomes the accessible alternative, and its own values rise accordingly. Buying a good FC now is a smart move.