Unearthed: 1967 Kellison Astra X-300 GT — The Astra-Built Evolution of the Kellison J-Series

The 1967 Kellison Astra X-300 GT was not a factory-built Kellison automobile in the conventional Chevrolet or Ford sense. It was a rare fiberglass kit car designed by Astra general manager Allen M. Germaine and developed from the Kellison J-series, with a raised roof, revised ventilation, a Corvette-related chassis concept, and a long list of donor-car components left for the builder to source and install. The most accurate description is the Astra X-300 GT, an Astra/Allied evolution of the Kellison J-series.

What the name really means

The compound name Kellison Astra X-300 GT is common in auction and reference coverage, but it can suggest a simpler corporate history than the evidence supports. Jim Kellison was an important early American fiberglass sports-car designer and kit-car entrepreneur. Related Kellison bodies were later distributed or produced through companies including Astra and Allied Fiberglass.

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The X-300 GT itself was an Astra design. Harold Pace’s account, reproduced by Geoff Hacker’s Undiscovered Classics, identifies Allen M. Germaine, Astra’s general manager, as the designer and describes the model as purely an Astra offering rather than a model sold by Kellison. The Astra Automotive Division operated under International Fiberglass Products Corporation, whose winter 1962–1963 catalog described fiberglass products manufactured in Sacramento, California, and Sauk Centre, Minnesota. Kellison’s influence is therefore real, but it is best understood as lineage rather than direct model branding.

For that reason, the most precise editorial and collector description is Astra X-300 GT, an Astra/Allied evolution of the Kellison J-series. Kellison Astra X-300GT remains a useful search term because that is how many surviving cars and auction records are identified.

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Why a 1967 example is not necessarily a 1967 model-year car

The year 1967 generally belongs to the identity, title, registration, or surviving example being discussed. It should not automatically be treated as a conventional factory model year. Kit bodies could be purchased, stored, assembled, modified, and registered over several years.

The available history places the X-300 GT in the mid-1960s specialty-car market. Bring a Trailer describes relatively few kits being sold between 1964 and 1968, while the Astra catalog evidence shows the design lineage as early as the winter of 1962–1963. A car recorded as a 1967 X-300 GT may therefore have a body, frame, donor components, and completion date spanning several years. Its frame markings, title history, original plans, and build paperwork are more useful for establishing what it is than the registration year alone.

From the J-series to the X-300 GT

The X-300 GT kept the unmistakable Kellison-era formula: a very low, dramatic fiberglass coupe with a long nose, compact cabin, and exaggerated sports-car proportions. Its principal improvement was practical. The roof was raised by approximately 2.5 inches over the J-5 form, providing more usable headroom without giving up the low-slung appearance.

One historical account compares the X-300 GT with the J-5, while Hot Rod describes it as a J-4-related model with a higher roofline. Those descriptions should not be treated as a major factual conflict. The J-4 and J-5 were closely related members of the same family, and writers have used different J-series references when explaining the X-300’s ancestry. The consistent point is that the X-300 GT was a taller-roof, more usable development of the earlier Kellison-style coupe.

The body incorporated several other changes intended to make the shape more practical. A prominent hood bulge allowed room for different engine installations. An oval grille treatment defined the nose, while rear-fender or quarter-panel scoops helped ventilate the cockpit and cool the brakes. Dual side vents were intended to extract hot air from the engine compartment. Corvette-derived door hinges were used in place of the older Chrysler hinge arrangement, and the design could accommodate roll-up window mechanisms.

These details matter because the X-300 GT was not simply a J-series body with a different badge. It represented an attempt to solve some of the earlier cars’ packaging problems while retaining the visual drama that made fiberglass kit cars attractive in the first place.

Fiberglass body, partial completion, and builder responsibility

The X-300 GT was not delivered as a finished, serialized sports car with one factory-approved drivetrain and a fixed interior specification. The body was molded fiberglass, and surviving documentation indicates that some examples were supplied with a frame or partially installed cockpit components. The Astra history says the dashboard, cockpit, and firewall were installed in the delivered body assembly, which made the car more complete than a bare shell. Even so, the buyer remained responsible for a considerable amount of engineering and fabrication.

Depending on the kit and the builder, that work could include sourcing glass, cutting instrument openings, installing gauges, completing the wiring, fabricating or adapting mounts, fitting the drivetrain, plumbing the fuel and cooling systems, installing lights, sealing the body, and finishing the interior. A surviving summary of the Astra instructions specifically describes cutting instrument openings with a hole saw or keyhole saw. That single detail captures the period kit-car experience: the customer was not merely assembling a model from prefinished modules but solving full-size automotive fitment problems.

This assembly philosophy explains the wide variation among surviving X-300 GTs. One may be a carefully engineered, period-style V8 sports car. Another may be an unfinished body-and-frame project. A third may retain the body but have later wheels, gauges, upholstery, electronics, suspension, or engine components that make it mechanically unlike another car carrying the same name.

Chassis and suspension: what the recommended layout involved

The Astra-associated chassis was a steel-tube design related in concept to a Corvette chassis. The historical description calls for a 3-by-4-inch steel-tube frame with an X-brace. The engine was positioned farther rearward than in a typical front-engine installation to improve weight distribution, while the rear axle was mounted over the frame to lower the center of gravity.

The layout was ambitious for a small fiberglass-car operation. Moving the engine rearward and placing the axle over the frame could improve packaging and center-of-gravity height, but those benefits depended on accurate fabrication, correct steering geometry, adequate cooling, and sound load paths. They should not be assumed merely because a surviving car has an X-300 body.

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The donor-car parts list is part of the car’s identity

Period Astra instructions called for a mixture of readily identifiable donor components. The list is historically valuable because it shows how the company reduced tooling and manufacturing costs, but it is not a modern parts-interchange catalog. Dimensions, availability, condition, and safety standards must be checked against the individual car.

A car that still contains the correct donor glass, hinges, lights, or original installation hardware can be more historically significant than one that merely has a clean body. Conversely, replacing obsolete or unsafe components may be the right decision for a road car. Historical correctness and modern usability are not always the same restoration goal.

How rare is the Astra X-300 GT?

The X-300 GT is rare, but its exact production total is unsettled. Rare Car Network has cited an estimate of approximately 500 examples and described the X-300 as one of the more successful Kellison-related designs. A later family comment reproduced by Undiscovered Classics says the number of kits shipped was not known. Bring a Trailer’s description of relatively few kits sold between 1964 and 1968 supports scarcity but does not establish a precise total.

The responsible conclusion is that no surviving production ledger has made 500 a settled fact. The number should be presented as an estimate, not as a verified factory count.

Kit-car production also creates a second layer of rarity. Some bodies were never completed, some projects were dismantled, and others were modified so heavily that their original identity is difficult to establish. Cars may also be registered under donor or individually assigned chassis identities. A surviving factory frame, original build plans, body-specific glass, intact hinges, and credible title history can therefore matter as much as the paint or engine when assessing historical interest.

What the documented 1967 car tells us about the market

Hagerty records a 1967 Kellison Astra X-300GT with VIN DRF90525 sold at the Barrett-Jackson Las Vegas event on September 25, 2014, for $38,500. The recorded car was a coupe powered by a 355 Chevrolet V8 with a four-barrel carburetor. It wore Cragar S/S wheels and BFGoodrich Radial T/A tires and had a Sony CD stereo.

The condition notes described fresh clearcoat paint, strong chrome and interior presentation, mixed-age gauges, and an underbody with aged undercoating. This is useful evidence that a highly finished, V8-powered X-300 GT could attract meaningful collector interest. It is not a current valuation, a factory price, or a model-wide average. The sale occurred in 2014, and the car’s equipment, condition, documentation, and auction presentation belonged specifically to that lot. That result should not be converted into a presumed 2026 price.

A separate project example documented by Bring a Trailer had a stripped fiberglass body, a Pontiac 350, a TH400 automatic transmission, a Corvette-based chassis, a replacement fuel tank and sending unit, original build plans, and unspecified documentation. The contrast between that project and the finished Barrett-Jackson car shows why broad price claims are especially unreliable for this model.

A serious valuation should compare genuinely similar recent sales and account for:

• Whether the body, frame, and cockpit components are complete and correctly identified.
• The quality and documentation of the restoration.
• The condition and engineering of the drivetrain, brakes, steering, cooling, and fuel systems.
• Whether the car retains unusual original components such as the correct glass and body hardware.
• Title, registration, inspection, and road-use legality in the relevant jurisdiction.
• Whether the buyer wants an authentic period build, a reliable driver, or a show-oriented custom.

A practical inspection and restoration sequence

The first rule is to inventory the actual car before ordering parts. There is no universal X-300 GT mechanical specification, and donor guidance from the 1960s is not a substitute for current engineering review.

1. Establish identity and provenance. Photograph and record frame markings, title history, body labels, build paperwork, original Astra instructions, donor receipts, and any previous restoration records. Treat the registration year as one clue rather than proof of the body’s manufacture date.
2. Inspect the fiberglass shell. Pay particular attention to the nose, door openings, roof, fender arches, hood, firewall, body mounts, hinge areas, and glass openings. Look for stress cracks, delamination, distortion, thin or poorly supported mounting points, and repairs that have not been properly bonded into the existing laminate.
3. Check the chassis before cosmetic work. Verify wheelbase, frame squareness, suspension pickup points, steering geometry, brake routing, axle alignment, weld quality, corrosion, and amateur modifications. A glossy body can conceal a chassis that is out of square or carrying loads through unsuitable fiberglass sections.
4. Measure every glass opening. The period instructions reference donor-car windshields and rear glass rather than a universal X-300 replacement. Measure the existing openings and check gasket channels, flange condition, curvature, and glass retention before sourcing replacements. Do not order a donor windshield solely because its year and make appear on an old parts list.
5. Audit the doors and windows. Determine whether the car still has the intended Corvette-style hinges and roll-up window mechanisms. Check hinge reinforcement, latch engagement, door sag, window travel, emergency opening, and weather sealing. Fiberglass doors can crack around hinges when loads are not adequately distributed.
6. Identify the complete drivetrain. Record the engine, transmission, clutch or converter arrangement, mounts, driveshaft, differential, axle shafts, cooling system, fuel system, exhaust routing, and electrical controls. A 355 Chevrolet, Pontiac 350, TH400, or other period-style installation may be appropriate to a particular build, but none is a universal X-300 GT specification.
7. Upgrade safety-critical systems where necessary. Have steering, braking, seat anchorage, fuel containment, wiring, lighting, glass retention, and restraint systems examined by a qualified professional. Check that modern replacements are properly mounted and do not introduce new clearance or load-path problems.
8. Resolve registration and insurance early. Kit-built vehicle titling, inspection, emissions treatment, equipment rules, and insurance classification vary by jurisdiction. Consult the applicable state or provincial motor-vehicle authority and an insurer before committing to a road-going restoration.
9. Test only after inspection and controlled commissioning. The available research does not document a road test, chassis test, crashworthiness evaluation, or independent mechanical inspection of the specific 1967 car. No driving impression or safety conclusion should be inferred from its appearance or auction description.

Choosing a restoration direction

Because the kit left so much to the builder, there is no single correct way to finish an X-300 GT. The sensible choice depends on the evidence contained in the car and the owner’s intended use.

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For an incomplete example, preserving evidence may be more valuable than immediately disassembling it. Photographing brackets, hinge positions, wiring routes, glass markings, and donor components before work begins can prevent the loss of information that makes a rare kit identifiable.

What can—and cannot—be specified about every X-300 GT

It is reasonable to associate the model with a raised fiberglass roof, hood bulge, oval grille treatment, ventilation scoops, Corvette-related chassis thinking, a 94- to 98-inch wheelbase range, and a builder-supplied mixture of donor parts. It is not reasonable to assign every surviving car a single engine, transmission, suspension system, curb weight, interior, glass source, or production number.

Nor should the X-300 GT be presented as a hidden mass-produced supercar. Its historical importance is more revealing than that. Fiberglass allowed a small American company to sell an aspirational sports-car shape while transferring much of the sourcing, fabrication, engineering, and finishing burden to the customer. The raised roof, better ventilation, donor-part list, and Corvette-related chassis components show an effort to make the concept more usable, but they also expose the practical difficulties of building a safe, weather-tight, legally registrable automobile from a kit.

Reading the surviving historical record

The strongest points in the surviving record come from the convergence of specialist accounts: the Astra identity, Germaine’s role, the raised-roof concept, the donor-component approach, the wheelbase range, and the chassis description are supported across the historical material. Production totals are less certain because the often-repeated estimate of approximately 500 cars is not backed by a surviving ledger. The 2014 Hagerty auction result is a credible historical sale record, but it has low value as a direct guide to the market in 2026.

Descriptions of individual cars should therefore separate original design information from later owner choices. A V8, Cragar wheels, modern stereo, replacement fuel tank, TH400 transmission, altered gauges, or custom upholstery may accurately describe a particular survivor without defining the Astra X-300 GT as a model.

Frequently Asked Questions

Was the X-300 GT made by Kellison or Astra?

The most accurate answer is Astra. It was an Astra model designed by general manager Allen M. Germaine, with Kellison ancestry through the related J-series fiberglass bodies and the Allied/Astra production history. Kellison Astra X-300 GT is a common compound reference, but it should not be treated as proof that Kellison sold the X-300 GT as one of its own factory models.

How many Astra X-300 GTs were built?

The exact total is unknown. Rare Car Network has cited an estimate of approximately 500 examples, while later historical commentary says the number of kits shipped was not known. The X-300 GT is demonstrably rare, but 500 should be presented as an estimate rather than a verified production figure.

What engine came in a 1967 X-300 GT?

There was no single factory engine specification. These were kit cars, so builders could install different engines, transmissions, axles, instruments, and suspension components. Documented examples include a Chevrolet 355 V8 and a Pontiac 350, but those installations describe individual cars rather than every X-300 GT.

Is a 1967 X-300 GT worth $38,500 today?

Not necessarily. Hagerty records a specific car selling for $38,500 at Barrett-Jackson in Las Vegas on September 25, 2014. That historical result demonstrates collector interest but is not a current 2026 valuation or a model-wide average. Current value depends on comparable recent sales, completeness, documentation, restoration quality, mechanical condition, legality, and originality.

Are replacement parts readily available for the X-300 GT?

The research does not establish a broad current source of X-300 GT-specific glass, trim, hinges, or factory reproduction parts. Period instructions reference donor components such as Studebaker, Buick, Chevrolet, Triumph, Ford, and Corvette parts, but every dimension and compatibility point must be verified on the individual car. Original plans and surviving body-specific hardware are especially valuable.

The Bottom Line

The Astra X-300 GT is best understood as a rare, Kellison-derived fiberglass specialty car—not a conventional 1967 Kellison production model. Its raised roof and revised ventilation made the J-series concept more usable, while its Corvette-related chassis and donor-part construction left the buyer with much of the real engineering work. That combination is precisely what makes the car historically fascinating and restoration-intensive. Verify the identity, preserve the paperwork, measure before ordering parts, and judge any example on its actual chassis, body, documentation, and safety—not on a universal specification or an old auction number.

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