--- id: 20261004_190000_stant-27135-thermostat-gasket-fitment-guide title: Stant 27135 Thermostat Gasket (Stat Lok, NOS) – Fitment Guide for Ford, Mercury (1962–1967) category: Parts Catalog corpus_topic: PartsCatalog site_category: Parts Catalog summary: Find the exact vehicles that fit the Stant 27135 Stat Lok thermostat gasket (also 25135, B35, Gates 33623). NOS inventory from Don's Obsolete Auto Parts (donsobsoleteautoparts.com). Verify year, model and engine before you order. Price is $9.95 plus shipping. description: Find the exact vehicles that fit the Stant 27135 Stat Lok thermostat gasket (also 25135, B35, Gates 33623). NOS inventory from Don's Obsolete Auto Parts (donsobsoleteautoparts.com). Verify year, model and engine before you order. Price is $9.95 plus shipping. question: Which vehicles does the Stant 27135 thermostat gasket fit, and where can I buy one? keypoints: - 'Part Number: Stant 27135 (single pack); same gasket as Stant 25135 / B35 in the Stant catalog and cross-reference tables' - 'Thermostat opening (mounting hole) diameter: 1.81 in. (per Gates/retailer data for the direct equivalent)' - Stant 1928–1994 catalog lists it for 2 make(s), 1962–1967 - Price is $9.95 plus shipping tags: - stant - stant-27135 - thermostat-gasket - stat-lok - restoration-parts - obsolete-auto-parts - fitment-guide - ford - mercury consent: true agent: misty created: '2026-10-05T02:38:49Z' updated: '2026-10-05T02:38:49Z' date: '2026-10-04' vault_stage: 07_CODEX enrich_status: ok enrich_method: bot enrich_blockers: [] pipeline_filename: stant-27135-thermostat-gasket-fitment-guide.md source_kind: authored proposed_topic: PartsCatalog lane: PartsCatalog content_status: approved routing_source: carbon prefix: misty headwaters: misty voice: misty active_voice: misty voices: - misty asker_site: donsobsoleteautoparts.com sample: false sentiment: helpful emotions: - reassured - confident sycophancy: 0 truth_score: 9 entropy: 3 predicted_narrative_arc: owner-searching-to-part-found share_url: https://donsobsoleteautoparts.com/kb/PartsCatalog/stant-27135-thermostat-gasket-fitment-guide.md source_url: '' part_number: Stant 27135 approved_by: Daniel Comp (chat, 2026-10-04 ~7:00 PM PT) --- # Stant 27135 Thermostat Gasket (Stat Lok, NOS) – Fitment Guide for Ford, Mercury (1962–1967) **Stant 27135 Stat Lok Engine Coolant Thermostat Gasket – NOS in Original Stant Packaging** Keep your classic on the road with a genuine Stant 27135, the Stant thermostat gasket for early Ford small-block V8s — the 221, 260 and early 289 — in 1962–1965 Fords and the 1967 Mercury Comet and Cougar 289. 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 27135 (single pack); same gasket as Stant 25135 / B35 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 33623; ACDelco 12G9; Fel-Pro 8E35064; GM OE 1623431, 571150; Motorcraft RG-505 Stant's own 1928–1994 application catalog lists the 27135 for 2 makes from 1962 to 1967. It is ideal for restoration projects, weekend drivers and mechanics working on obsolete iron. **Compatible Makes & Models (from the Stant catalog)** - **Ford** (1962–1965): 300 (1963), Custom (1964–1965), Fairlane (1962–1965), Falcon (1963–1965), Galaxie (1963–1965), Mustang (1964–1965) - **Mercury** (1967): Comet (1967), Cougar (1967) **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 (misty@donsobsoleteautoparts.com), 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 misty@donsobsoleteautoparts.com. **The Stant 27135 Thermostat Gasket: The Right Seal for Ford and Mercury 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 27135** is the Stant thermostat gasket for early Ford small-block V8s — the 221, 260 and early 289 — in 1962–1965 Fords and the 1967 Mercury Comet and Cougar 289. 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 27135 across 2 makes (Ford, Mercury). Cross-reference tables tie it to the Stant 25135, Gates 33623 and Fel-Pro 8E35064, which makes it easy to match against an old parts list or a worn-out gasket. **Real-World Fitment Examples** - 1962–1964 Ford Fairlane with the 221, 260 or 289 V8 - 1963–1964 Ford Falcon and Galaxie with the 260 or 289 - 1964–1965 Ford Custom and 1964–1965 Mustang with the 289 (catalog note: Feb. & Older) - 1967 Mercury Comet and Cougar with the 289 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 27135 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 27135 is a period-correct, ready-to-install solution. --- ## Fitment appendix — every Stant catalog line for 27135 Source: Stant *Thermostats, Gaskets, Caps – 1928 through 1994* (application pages). Format: Model — years [engine: years] (notes). Catalog coverage ends with 1994 models. **Ford** - 300 — 1963 [V-8 260: 1963] - Custom — 1964–1965 [V-8 289: 1964–1965 (Feb. & Older)] - Fairlane — 1962–1965 [V-8 221: 1962–1963; V-8 260: 1962–1964; V-8 289: 1963–1965 (Feb. & Older)] - Falcon — 1963–1965 [V-8 260: 1963–1964; V-8 289: 1965 (Feb. & Older)] - Galaxie — 1963–1965 [V-8 260: 1963; V-8 289: 1963–1965 (Feb. & Older)] - Mustang — 1964–1965 [V-8 289: 1964–1965 (Feb. & Older)] **Mercury** - Comet — 1967 [V-8 289: 1967] - Cougar — 1967 [V-8 289: 1967] ## Cross-references (full) - **Gates:** 33623 - **ACDelco:** 12G9 - **Fel-Pro:** 8E35064 - **GM OE:** 1623431, 571150 - **Motorcraft:** RG-505 - **Stant equivalents:** 25135 (multi/bulk-pack number paired with 27135 in the catalog), B35 ## 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 428–512; 9 pages list 27135). Every catalog line pairs "Thermostat Gasket 25135" with "Thermostat Gasket (1 Pack) 27135". 2. AutoPartsPrime – STANT 27135 Engine Coolant Thermostat Gasket (type, UPC, fitment): https://www.autopartsprime.com/stant/engine-coolant-thermostat-gasket/mp-27135 3. PartsHawk – Gates 33623 (interchange lists Stant 27135; mounting hole diameter 1.81"; fitment): https://partshawk.com/gates-33623-engine-coolant-thermostat-housing-gasket.html 4. KaKaPart – Stant 27135 (type "Thermostat Gasket", hole diameter 1.81"; application table): http://www.kakapart.com/parts/stant-27135.html