Stant 27175 Thermostat Gasket (Stat Lok, NOS) – Fitment Guide for Chevrolet, GMC (1979–1984)
Fitment Guide for Chevrolet, GMC (1979–1984)
Stant 27175 Stat Lok Engine Coolant Thermostat Gasket – NOS in Original Stant Packaging
Keep your classic on the road with a genuine Stant 27175, the Stant thermostat gasket for the 1979–1984 Chevrolet and GMC 250 cubic-inch (4.1L) inline six in C & K pickups, G-Series vans, and the Blazer and Jimmy. 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 27175 (single pack); same gasket as Stant 25175 / B75 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: 1.81 in. (per Gates/retailer data for the direct equivalent)
- Condition: New Old Stock (NOS) in original Stant packaging
- Cross-references: Gates 33647; ACDelco 12G29; Fel-Pro 35218, 8E35218; Victor Reinz C24167
Stant's own 1928–1994 application catalog lists the 27175 for 2 makes from 1979 to 1984. It is ideal for restoration projects, weekend drivers and mechanics working on obsolete iron.
Compatible Makes & Models (from the Stant catalog)
- Chevrolet (1979–1984): Blazer (1979–1982), C & K Series Pickup (1979–1984), G Series Van (1980–1984)
- GMC (1979–1984): C & K Series Pickup (1979–1984), G Series Van (1980–1984), Jimmy (1979–1982)
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 27175 Thermostat Gasket: The Right Seal for Chevrolet and GMC 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 27175 is the Stant thermostat gasket for the 1979–1984 Chevrolet and GMC 250 cubic-inch (4.1L) inline six in C & K pickups, G-Series vans, and the Blazer and Jimmy. 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 27175 across 2 makes (Chevrolet, GMC). Cross-reference tables tie it to the Stant 25175, Gates 33647 and Fel-Pro 35218, which makes it easy to match against an old parts list or a worn-out gasket.
Real-World Fitment Examples
- 1979–1984 Chevrolet/GMC C & K pickups 250/4.1L six
- 1980–1984 Chevrolet/GMC G-Series vans 4.1L six
- 1979–1982 Chevrolet Blazer and GMC Jimmy 250/4.1L six
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 27175 is listed at about 1.81 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 27175 is a period-correct, ready-to-install solution.
Fitment appendix — every Stant catalog line for
27175
Source: Stant Thermostats, Gaskets, Caps – 1928 through 1994 (application pages). Format: Model — years [engine: years] (notes). Catalog coverage ends with 1994 models.
Chevrolet
- Blazer — 1979–1982 [6-Cyl. 250: 1979; 6-Cyl. 4.1 L: 1980–1982]
- C & K Series Pickup — 1979–1984 [6-Cyl. 250: 1979; 6-Cyl. 4.1 L: 1980–1984]
- G Series Van — 1980–1984 [6-Cyl. 4.1 L: 1980–1984]
GMC
- C & K Series Pickup — 1979–1984 [6-Cyl. 250: 1979; 6-Cyl. 4.1 L: 1980–1984]
- G Series Van — 1980–1984 [6-Cyl. 4.1 L: 1980–1984]
- Jimmy — 1979–1982 [6-Cyl. 250: 1979; 6-Cyl. 4.1 L: 1980–1982]
Cross-references (full)
- Gates: 33647
- ACDelco: 12G29
- Fel-Pro: 35218, 8E35218
- Victor Reinz: C24167
- Stant equivalents: 25175 (multi/bulk-pack number paired with 27175 in the catalog), B75
Sources
- 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 350–468; 10 pages list 27175). Every catalog line pairs "Thermostat Gasket 25175" with "Thermostat Gasket (1 Pack) 27175".
- PartsHawk – Gates 33647 (interchange lists Stant 27175; mounting hole diameter 1.81"; fitment): https://partshawk.com/gates-33647-engine-coolant-thermostat-housing-gasket.html
- KaKaPart – Stant 27175 (type "Thermostat Gasket", hole diameter 1.81"; application table): http://www.kakapart.com/parts/stant-27175.html
- FinditParts – Gates 33647 (cross-references list Stant 27175; ACDelco 12G29; Fel-Pro 35218): https://www.finditparts.com/products/333166/gates-33647
- AutohausAZ – Gates 33647 fitment: https://www.autohausaz.com/pn/ZO-33647
- Parts Universe – Stant 27175 listing (existence): https://mypartsuniverse.com/products/stant-27175-thermostat-gasket