Ask Don · 20261004_190000_stant-27148-thermostat-gasket-fitment-guide

Stant 27148 Thermostat Gasket (Stat Lok, NOS) – Fitment Guide for American Motors, Bricklin, Buick, Cadillac, Chevrolet, GMC and more (1964–1990)

Fitment Guide for American Motors, Bricklin, Buick, Cadillac, Chevrolet, GMC and more (1964–1990)

Stant 27148 Stat Lok Engine Coolant Thermostat Gasket – NOS in Original Stant Packaging

Keep your classic on the road with a genuine Stant 27148, the Stant thermostat gasket for AMC and Jeep V8s (290 through 401 and the 5.9L) from 1966 to 1990, and for Oldsmobile-built V8s — including the 403, the Olds 5.0L and the 5.7L and 4.3L diesels — used across Oldsmobile, Buick, Cadillac, Pontiac, Chevrolet and GMC. Stant's Stat Lok gaskets have an adhesive backing that holds the thermostat centered in its seat while you bolt the housing down — no gasket cement, no thermostat falling out, and less risk of misalignment or cracking the outlet flange.

Key Features

• Part Number: Stant 27148 (single pack); same gasket as Stant 25148 / B48 in the Stant catalog and cross-reference tables
• Type: Engine coolant thermostat (housing/water outlet) gasket, Stat Lok adhesive-backed
• Thermostat opening (mounting hole) diameter: 1.69 in. (per Gates/retailer data for the direct equivalent)
• Condition: New Old Stock (NOS) in original Stant packaging
• Cross-references: Gates 33631; ACDelco 12G12; AMC OE 3187543; Fel-Pro 35130, 8E35130; GM OE 561999

Stant's own 1928–1994 application catalog lists the 27148 for 9 makes from 1964 to 1990. It is ideal for restoration projects, weekend drivers and mechanics working on obsolete iron.

Compatible Makes & Models (from the Stant catalog)

• American Motors (1966–1979): Ambassador (1967–1974), American (1966–1968), AMX (1968–1974, 1978–1979), Concord (1978–1979), Gremlin (1972–1976), Hornet (1970–1977), Javelin (1968–1974), Marlin (1967), Matador (1971–1978), Pacer (1978–1979), Rambler (1969), Rebel (1967–1970), Spirit (1979)
• Bricklin (1974): SV-1 (1974)
• Buick (1977–1990): Century (1977, 1981–1985, 1987), Electra (1977–1989), Estate Wagon (1977–1979), LeSabre (1977–1990), Regal (1977, 1981–1987), Riviera (1977–1985), Skylark (1977)
• Cadillac (1976–1990): Brougham (1987–1990), DeVille (1979–1985), Eldorado (1979–1985), Fleetwood (1979–1986), Seville (1976–1985)
• Chevrolet (1978–1990): C & K Series Pickup (1978–1981), Caprice (1980, 1982, 1986–1990), Celebrity (1982–1985), El Camino (1983–1984), Impala (1980–1985), Malibu (1982–1983), Monte Carlo (1982–1984), Suburban (1978–1980)
• GMC (1978–1981, 1983–1984): C & K Series Pickup (1978–1981), Caballero (1983–1984), Suburban (1978–1980)
• Jeep (1971–1990): Cherokee (1974–1983), CJ Series (1972–1981), Commando (1972), Grand Wagoneer (1984–1990), J Series Pickup (1971–1988), Wagoneer (1971–1983)
• Oldsmobile (1964–1990): 442 (1968–1971), Custom Cruiser (1971–1990), Cutlass (1967–1987), Cutlass Cruiser (1978–1981), Cutlass Supreme (1988), Delmont 88 (1967–1968), Delta 88 (1967–1985), Eighty Eight (1965–1966), F85 (1964–1972), Jetstar 88 (1964–1966), Jetstar I (1964–1965), Ninety Eight (1965–1985), Omega (1973–1977, 1979), Starfire (1965–1966), Toronado (1966–1985), Vista Cruiser (1964–1975)
• Pontiac (1975–1989): Bonneville (1977–1984), Catalina (1977–1981), Firebird (1977–1979, 1981), Grand Am (1978–1979), Grand LeMans (1976–1977, 1979, 1981), Grand Prix (1977–1979, 1981–1984), Grand Safari (1977–1978), LeMans (1976–1979, 1981), Parisienne (1983–1986), Phoenix (1977), Safari (1987–1989), Ventura (1975–1977)

Note: Always verify fitment for your specific year, make, model and engine. The full engine-by-engine list is in the fitment appendix below. If you have your old gasket, compare its shape, bolt holes and opening size — or just ask Don and Kathy.

Price is $9.95 plus shipping. Don and Kathy offer a fair deal for this. Buying for a club, a shop, or a whole fleet of project cars? Even better.

Why Buy From Don & Kathy at Don's Obsolete Auto Parts? Don Leask founded one of the earliest online obsolete auto parts businesses (carparts2 on eBay in 1997 — the second auto parts store on eBay) and grew it to 11,000–17,000 unique listings. Today, with help from their digital agent Misty ([email protected]), Don and Kathy connect directly with restorers and collectors while preserving their legacy of quality parts. These gaskets come from Don's own shelves, in original Stant packaging.

To reach them, click the "Don & Kathy Leask" button at the bottom left of any page on donsobsoleteautoparts.com, or email [email protected].

The Stant 27148 Thermostat Gasket: The Right Seal for American Motors and Bricklin Restorations

Thermostat gaskets are small, but they decide whether a cooling system stays dry. When the thermostat housing comes off a project car or truck, the right gasket is the quiet part that keeps the job from turning into a second trip to the parts counter.

The Stant 27148 is the Stant thermostat gasket for AMC and Jeep V8s (290 through 401 and the 5.9L) from 1966 to 1990, and for Oldsmobile-built V8s — including the 403, the Olds 5.0L and the 5.7L and 4.3L diesels — used across Oldsmobile, Buick, Cadillac, Pontiac, Chevrolet and GMC. Like the rest of Stant's Stat Lok line, it has an adhesive backing that holds the thermostat in place during installation, so it seats squarely and seals the first time.

Why This Gasket Matters Stant's application catalog covering 1928 through 1994 lists the 27148 across 9 makes (American Motors, Bricklin, Buick, Cadillac, Chevrolet, GMC, Jeep, Oldsmobile, Pontiac). Cross-reference tables tie it to the Stant 25148, Gates 33631 and Fel-Pro 35130, which makes it easy to match against an old parts list or a worn-out gasket.

Real-World Fitment Examples

• AMC AMX, Javelin, Ambassador, Rebel, Matador and Hornet V8s
• Jeep CJ, Cherokee, Wagoneer, Grand Wagoneer and J-Series V8s
• Oldsmobile 442, Cutlass, Delta 88, Ninety Eight, Toronado and Vista Cruiser
• Buick, Pontiac and Cadillac models with the Olds 403 V8 or 5.7L diesel
• Chevrolet/GMC C/K pickups and Suburban with the 350/5.7L diesel (1978–1981)

Because these were high-volume service items, NOS stock still turns up in collections like Don Leask's — in original Stant packaging, sorted by number.

Preserving American Automotive History Don and Kathy Leask have been part of the classic car world since the early days of the internet. Starting with carparts2 on eBay in 1997, they became one of the largest online sellers of obsolete parts. Now, with their AI-assisted Don's Obsolete Auto Parts site and digital agent Misty, they're making hard-to-find parts discoverable again — connecting owners of rare inventory with the enthusiasts who need them.

Buying Tips

• Match three things before ordering: year, model and engine. Some engines had more than one thermostat housing design.
• Measure the thermostat opening: the 27148 is listed at about 1.69 in.
• Prefer original packaging for authenticity; keep the Stant label with the part.
• Restoration shops, clubs and collectors can ask about quantity pricing.

Whether you're chasing a concours restoration or simply keeping a classic on the road, the Stant 27148 is a period-correct, ready-to-install solution.

Fitment appendix — every Stant catalog line for

27148

Source: Stant Thermostats, Gaskets, Caps – 1928 through 1994 (application pages). Format: Model — years [engine: years] (notes). Catalog coverage ends with 1994 models.

American Motors

• Ambassador — 1967–1974 [V-8 290: 1967–1969; V-8 304: 1970–1974; V-8 343: 1967–1969; V-8 360: 1970–1974; V-8 390: 1968–1970; V-8 401: 1971–1974]
• American — 1966–1968 [V-8 290: 1966–1968; V-8 343: 1967]
• AMX — 1968–1974, 1978–1979 [V-8 290: 1968–1969; V-8 304: 1972–1974, 1978–1979; V-8 343: 1968–1969; V-8 360: 1970–1974; V-8 390: 1968–1970; V-8 401: 1971–1974]
• Concord — 1978–1979 [V-8 304: 1978–1979]
• Gremlin — 1972–1976 [V-8 304: 1972–1976]
• Hornet — 1970–1977 [V-8 304: 1970–1977; V-8 360: 1971–1974]
• Javelin — 1968–1974 [V-8 290: 1968–1969; V-8 304: 1970–1974; V-8 343: 1968–1969; V-8 360: 1970–1974; V-8 390: 1968–1970; V-8 401: 1971–1974]
• Marlin — 1967 [V-8 290: 1967; V-8 343: 1967]
• Matador — 1971–1978 [V-8 304: 1971–1977; V-8 360: 1971–1978; V-8 401: 1971–1976]
• Pacer — 1978–1979 [V-8 304: 1978–1979]
• Rambler — 1969 [V-8 290 / V-8 390: 1969]
• Rebel — 1967–1970 [V-8 290: 1967–1969; V-8 304: 1970; V-8 343: 1967–1969; V-8 360: 1970; V-8 390: 1969–1970]
• Spirit — 1979 [V-8 304: 1979]

Bricklin

• SV-1 — 1974 [V-8 351: 1974]

Buick

• Century — 1977, 1981–1985, 1987 [4-Cyl. 2.5 L: 1987; V-6 4.3 L Diesel: 1982–1985; V-8 350: 1977 (engine VIN code R); V-8 403: 1977; V-8 5.7 L Diesel: 1981]
• Electra — 1977–1989 [V-6 4.3 L Diesel: 1985; V-8 350: 1977–1979 (engine VIN code R); V-8 403: 1977–1979; V-8 5.0 L: 1981–1989; V-8 5.7 L: 1980 (engine VIN code R); V-8 5.7 L (Canada): 1981; V-8 5.7 L Diesel: 1980–1985]
• Estate Wagon — 1977–1979 [V-8 350: 1977–1979 (engine VIN code R); V-8 403: 1977–1979]
• LeSabre — 1977–1990 [V-8 350: 1977–1979 (engine VIN code R); V-8 403: 1977–1978; V-8 5.0 L: 1981–1990; V-8 5.7 L: 1980 (engine VIN code R); V-8 5.7 L Diesel: 1980–1985]
• Regal — 1977, 1981–1987 [V-6 4.3 L Diesel: 1982–1985; V-8 350: 1977 (engine VIN code R); V-8 5.0 L: 1986–1987 (engine VIN code Y); V-8 5.7 L Diesel: 1981–1983]
• Riviera — 1977–1985 [V-8 350: 1977–1979 (engine VIN code R); V-8 403: 1977–1978; V-8 5.0 L: 1980–1985; V-8 5.7 L: 1980; V-8 5.7 L Diesel: 1981–1985]
• Skylark — 1977 [V-8 350: 1977 (engine VIN code R)]

Cadillac

• Brougham — 1987–1990 [V-8 5.0 L: 1987–1990]
• DeVille — 1979–1985 [V-6 4.3 L Diesel: 1985; V-8 350 Diesel: 1979; V-8 5.7 L Diesel: 1980–1984]
• Eldorado — 1979–1985 [V-8 350 / V-8 350 Diesel: 1979; V-8 5.7 L: 1980; V-8 5.7 L Diesel: 1980–1985]
• Fleetwood — 1979–1986 [V-6 4.3 L Diesel: 1985; V-8 350 Diesel: 1979; V-8 5.0 L: 1986; V-8 5.7 L Diesel: 1980–1985]
• Seville — 1976–1985 [V-8 350: 1976–1979; V-8 350 Diesel: 1978–1979; V-8 5.7 L: 1980; V-8 5.7 L Diesel: 1980–1985]

Chevrolet

• C & K Series Pickup — 1978–1981 [V-8 350 Diesel: 1978–1979; V-8 5.7 L Diesel: 1980–1981; V-8 6.6 L (Canada): 1981]
• Caprice — 1980, 1982, 1986–1990 [V-8 5.0 L: 1986–1990 (engine VIN code Y); V-8 5.7 L Diesel: 1980, 1982]
• Celebrity — 1982–1985 [V-6 4.3 L Diesel: 1982–1985]
• El Camino — 1983–1984 [V-8 5.7 L Diesel: 1983–1984]
• Impala — 1980–1985 [V-8 5.7 L Diesel: 1980–1985]
• Malibu — 1982–1983 [V-6 4.3 L Diesel: 1982–1983; V-8 5.7 L Diesel: 1982–1983]
• Monte Carlo — 1982–1984 [V-6 4.3 L Diesel: 1982–1983; V-8 5.7 L Diesel: 1982–1984]
• Suburban — 1978–1980 [V-8 350: 1978–1979; V-8 350 Diesel: 1978; V-8 5.7 L: 1980]

GMC

• C & K Series Pickup — 1978–1981 [V-8 350 Diesel: 1978–1979; V-8 5.7 L Diesel: 1980–1981; V-8 6.6 L (Canada): 1981]
• Caballero — 1983–1984 [V-8 5.7 L Diesel: 1983–1984]
• Suburban — 1978–1980 [V-8 350: 1978–1979; V-8 350 Diesel: 1978; V-8 5.7 L: 1980]

Jeep

• Cherokee — 1974–1983 [V-8 360: 1974–1979; V-8 401: 1974–1978; V-8 5.9 L: 1980–1983]
• CJ Series — 1972–1981 [V-8 304: 1972–1979; V-8 5.0 L: 1980–1981]
• Commando — 1972 [V-8 304: 1972]
• Grand Wagoneer — 1984–1990 [V-8 5.9 L: 1984–1990]
• J Series Pickup — 1971–1988 [V-8 304: 1971–1972; V-8 360: 1971–1979; V-8 401: 1974–1978; V-8 5.9 L: 1980–1988]
• Wagoneer — 1971–1983 [V-8 304: 1971; V-8 360: 1971–1979; V-8 401: 1974–1978; V-8 5.9 L: 1980–1983]

Oldsmobile

• 442 — 1968–1971 [V-8 400: 1968–1969; V-8 455: 1968–1971]
• Custom Cruiser — 1971–1990 [V-8 350: 1973, 1977–1979 (engine VIN code R); V-8 350 Diesel: 1978–1979; V-8 400: 1975; V-8 403: 1977–1979; V-8 455: 1971–1976; V-8 5.0 L: 1980–1990; V-8 5.7 L: 1980; V-8 5.7 L Diesel: 1980–1985]
• Cutlass — 1967–1987 [V-6 4.3 L Diesel: 1982–1984; V-8 260: 1975–1979; V-8 260 Diesel: 1979; V-8 330: 1967; V-8 350: 1968–1971, 1975–1977, 1979; V-8 4.3 L: 1980–1982; V-8 4.4 L (Canada): 1981; V-8 400: 1967; V-8 403: 1977; V-8 455: 1970–1976; V-8 5.0 L: 1982–1987 (engine VIN code Y); V-8 5.7 L: 1980; V-8 5.7 L Diesel: 1980–1985]
• Cutlass Cruiser — 1978–1981 [V-8 260: 1978–1979; V-8 350: 1979 (engine VIN code R); V-8 350 Diesel: 1979; V-8 4.3 L: 1980–1981; V-8 5.0 L: 1981; V-8 5.7 L Diesel: 1980–1981]
• Cutlass Supreme — 1988 [V-8 5.0 L: 1988]
• Delmont 88 — 1967–1968 [V-8 330: 1967; V-8 350: 1968; V-8 425: 1967; V-8 455: 1968]
• Delta 88 — 1967–1985 [V-8 260: 1977–1979; V-8 301: 1979; V-8 350: 1969, 1971–1972, 1975–1979 (engine VIN code R); V-8 350 Diesel: 1978–1979; V-8 4.3 L: 1980–1982; V-8 403: 1977–1979; V-8 425: 1967; V-8 455: 1968–1976; V-8 5.0 L: 1980–1985; V-8 5.7 L: 1980; V-8 5.7 L Diesel: 1980–1985]
• Eighty Eight — 1965–1966 [V-8 425: 1965–1966]
• F85 — 1964–1972 [V-8 330: 1964–1967; V-8 350: 1968–1971; V-8 400: 1965–1966; V-8 455: 1972]
• Jetstar 88 — 1964–1966 [V-8 330: 1964–1966]
• Jetstar I — 1964–1965 [V-8 330: 1964; V-8 425: 1965]
• Ninety Eight — 1965–1985 [V-6 4.3 L Diesel: 1985; V-8 350: 1973, 1975, 1977–1979; V-8 350 Diesel: 1978–1979; V-8 403: 1977–1979; V-8 425: 1965–1967; V-8 455: 1968–1976; V-8 5.0 L: 1980–1984; V-8 5.7 L: 1980; V-8 5.7 L Diesel: 1980–1984]
• Omega — 1973–1977, 1979 [V-8 260: 1975–1977; V-8 350: 1973–1974, 1977, 1979 (engine VIN code R)]
• Starfire — 1965–1966 [V-8 425: 1965–1966]
• Toronado — 1966–1985 [V-8 350 / V-8 350 Diesel: 1979; V-8 403: 1977–1978; V-8 425: 1966–1967; V-8 455: 1968–1976; V-8 5.0 L: 1980–1985; V-8 5.7 L: 1980; V-8 5.7 L Diesel: 1980–1985]
• Vista Cruiser — 1964–1975 [V-8 330: 1964–1967; V-8 350: 1968–1975; V-8 400: 1968–1969; V-8 455: 1970–1975]

Pontiac

• Bonneville — 1977–1984 [V-8 301: 1978–1979 (engine VIN code W); V-8 350: 1977–1979 (engine VIN code R); V-8 403: 1977–1979; V-8 5.0 L: 1981; V-8 5.7 L: 1980 (engine VIN code R); V-8 5.7 L Diesel: 1980–1984]
• Catalina — 1977–1981 [V-8 301: 1978–1979 (engine VIN code W); V-8 350: 1977–1979 (engine VIN code R); V-8 403: 1977–1979; V-8 5.0 L: 1981; V-8 5.7 L: 1980 (engine VIN code R); V-8 5.7 L Diesel: 1980–1981]
• Firebird — 1977–1979, 1981 [V-8 301: 1979 (engine VIN code W); V-8 350: 1977 (engine VIN code R); V-8 4.9 L: 1981 (engine VIN code W); V-8 403: 1977–1979]
• Grand Am — 1978–1979 [V-8 301: 1978–1979 (engine VIN code W)]
• Grand LeMans — 1976–1977, 1979, 1981 [V-8 260: 1976; V-8 301: 1979 (engine VIN code W); V-8 350: 1977 (engine VIN code R); V-8 4.9 L: 1981; V-8 403: 1977]
• Grand Prix — 1977–1979, 1981–1984 [V-8 301: 1978–1979 (engine VIN code W); V-8 350: 1977 (engine VIN code R); V-8 403: 1977; V-8 5.7 L Diesel: 1981–1984]
• Grand Safari — 1977–1978 [V-8 350: 1977–1978 (engine VIN code R); V-8 403: 1977–1978]
• LeMans — 1976–1979, 1981 [V-8 260: 1976; V-8 301: 1978–1979 (engine VIN code W); V-8 350: 1977 (engine VIN code R); V-8 4.9 L: 1981; V-8 403: 1977]
• Parisienne — 1983–1986 [V-8 5.0 L: 1986 (engine VIN code Y); V-8 5.7 L Diesel: 1983–1985]
• Phoenix — 1977 [V-8 350: 1977 (engine VIN code R)]
• Safari — 1987–1989 [V-8 5.0 L: 1987–1989]
• Ventura — 1975–1977 [V-8 260: 1975–1976; V-8 350: 1977 (engine VIN code R)]

Cross-references (full)

• Gates: 33631
• ACDelco: 12G12
• AMC OE: 3187543
• Fel-Pro: 35130, 8E35130
• GM OE: 561999
• Stant equivalents: 25148 (multi/bulk-pack number paired with 27148 in the catalog), B48

Sources

1. Stant Thermostats, Gaskets, Caps – 1928 through 1994 catalog (scan on Internet Archive): https://archive.org/details/StantThermostatsGasketsCaps1928Through1994OCR637Pages — Stant part-number index ("Make / Year(s)" table, PDF p. 633–634) and application pages (PDF pages 305–601; 92 pages list 27148). Every catalog line pairs "Thermostat Gasket 25148" with "Thermostat Gasket (1 Pack) 27148".
2. AutoPartsPrime – STANT 27148 Engine Coolant Thermostat Gasket (type, UPC, fitment): https://www.autopartsprime.com/stant/engine-coolant-thermostat-gasket/mp-27148
3. PartsHawk – Gates 33631 (interchange lists Stant 27148; mounting hole diameter 1.69"; fitment): https://partshawk.com/gates-33631-engine-coolant-thermostat-housing-gasket.html
4. KaKaPart – Stant 27148 (type "Thermostat Gasket", hole diameter 1.69"; application table): http://www.kakapart.com/parts/stant-27148.html

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