{"product_id":"biglknm-thermostat-housing-water-neck-for-mopar-v-8-318-440-billet-aluminum-direct-fit-with-gasket-screws","title":"BIGLKNM Thermostat Housing Water Neck for Mopar V‑8 318–440 Billet Aluminum Direct‑Fit with Gasket \u0026 Screws","description":"\u003cp\u003e\u003cstrong\u003eBIGLKNM billet aluminum water neck thermostat housing built to fit Mopar V‑8 engines from 1957–1980, providing a durable, corrosion-resistant replacement with included gasket and stainless screws.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eRestore coolant routing and top-end sealing on classic Chrysler, Dodge, and Plymouth V‑8s with a precision-machined thermostat neck engineered as a direct-fit service part. This assembly replaces aging cast or cracked housings on small- and big-block Mopar motors — including popular displacements such as 273, 318, 340, 360, 361, 383, 400, 413, 426W and 440 — and arrives with the hardware needed for a straightforward install.\u003c\/p\u003e\n\n\u003ch3\u003eWhich Mopar engines and years will this thermostat housing work with?\u003c\/h3\u003e\n\u003cp\u003eDesigned to match original mounting points and coolant passages, the housing fits a wide range of Mopar V‑8 engines produced between 1957 and 1980. Confirm compatibility by comparing the flange and bolt pattern with your existing housing before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible engines: 273, 318, 340, 360, 361, 383, 400, 413, 426w, 440\u003c\/li\u003e\n  \u003cli\u003eFits both small‑block and big‑block Mopar V‑8 platforms\u003c\/li\u003e\n  \u003cli\u003eIntended model years: 1957–1980\u003c\/li\u003e\n  \u003cli\u003eDirect‑fit design reduces the need for modification\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow is the BIGLKNM housing constructed and what are the benefits?\u003c\/h3\u003e\n\u003cp\u003eThis thermostat neck is CNC‑machined from billet aluminum for consistent wall thickness and a smooth mating surface. Aluminum resists rust and offers improved heat dissipation compared with many older cast housings, while the polished finish resists corrosion and looks period‑correct under the hood.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBillet aluminum for strength and even cooling\u003c\/li\u003e\n  \u003cli\u003eSmooth sealing surface to improve gasket life\u003c\/li\u003e\n  \u003cli\u003eCorrosion resistance extends service intervals\u003c\/li\u003e\n  \u003cli\u003eAttractive finish for restored engine bays\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat comes in the kit and what tools do I need to install it?\u003c\/h3\u003e\n\u003cp\u003eThe package contains everything required to replace the housing: the billet thermostat neck, a non‑asbestos gasket, and two stainless steel screws. Installation is a basic engine‑bay job; typical tools include a ratchet set, torque wrench, gasket scraper, and coolant catch pan.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncluded: billet housing, non‑asbestos gasket, 2 stainless screws\u003c\/li\u003e\n  \u003cli\u003eRecommended tools: ratchet, torque wrench, gasket scraper, coolant pan\u003c\/li\u003e\n  \u003cli\u003eExpect to drain some coolant, then refill and bleed system after install\u003c\/li\u003e\n  \u003cli\u003eCheck torque specs for your engine when tightening screws\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this change thermostat size or require other parts?\u003c\/h3\u003e\n\u003cp\u003eThe BIGLKNM neck is intended as a direct replacement and does not alter thermostat bore dimensions or hose connection geometry for compatible engines. In most cases you can reuse the original thermostat and upper radiator hose, but inspect rubber parts and the thermostat for wear and replace if necessary.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThermostat bore matches original equipment fitment\u003c\/li\u003e\n  \u003cli\u003eUpper radiator hose usually remains compatible\u003c\/li\u003e\n  \u003cli\u003eReplace worn hoses or an old thermostat for best results\u003c\/li\u003e\n  \u003cli\u003eVerify hose clamp locations and clearance before finishing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Owners and restorers of classic Mopar V‑8 vehicles seeking a long‑lasting replacement for a worn or damaged thermostat housing. Mechanically inclined DIYers, restoration shops, and performance builders will appreciate the durable billet construction and included hardware that simplify installation and improve under‑hood appearance.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this housing fit my 318 engine?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — it fits Mopar 318 V‑8s from 1957–1980 when your flange and bolt pattern match the original housing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are the mounting screws included?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the kit includes two stainless steel screws plus a non‑asbestos gasket for installation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"BIGLKNM","offers":[{"title":"Default Title","offer_id":48084592853150,"sku":"B0C9CH12JY","price":37.84,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/biglknm-front-packaging-water-neck.jpg?v=1785860340","url":"https:\/\/northtrailauto.ca\/products\/biglknm-thermostat-housing-water-neck-for-mopar-v-8-318-440-billet-aluminum-direct-fit-with-gasket-screws","provider":"North Trail Auto","version":"1.0","type":"link"}