{"product_id":"shlpdfm-carburetor-spacer-1in-black-phenolic-open-for-holley-4150-4160-adds-plenum-volume-reduces-heat-transfer","title":"SHLPDFM Carburetor Spacer 1in Black Phenolic Open for Holley 4150\/4160 — Adds Plenum Volume, Reduces Heat Transfer","description":"\u003cstrong\u003eSHLPDFM 1\" black phenolic open carburetor spacer fits Holley 4150\/4160-style 4-barrel carbs to add plenum volume and reduce heat transfer between the intake and carburetor.\u003c\/strong\u003e\n\nThis 1\" open spacer is molded from phenolic resin and designed for square-bore 4-barrel carburetors such as Holley 4150\/4160, Barry Grant, Carter and Edelbrock. It ships with two gaskets and mounting hardware so it’s ready to install on many small- and big-block Chevy, Ford and Chrysler Mopar applications. The spacer’s open center increases plenum volume for high-rpm breathing while the phenolic material helps insulate the carburetor from manifold heat.\n\n\u003ch3\u003eHow does a 1\" phenolic spacer affect carburetor heat and fuel mixture?\u003c\/h3\u003e\n\u003cp\u003eThe phenolic material has lower thermal conductivity than aluminum, which slows heat flow from the intake manifold into the carburetor base. That helps keep the fuel charge cooler and denser under many operating conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePhenolic construction reduces heat soak compared with metal spacers.\u003c\/li\u003e\n  \u003cli\u003eCooler carburetor base can help maintain more consistent air\/fuel density.\u003c\/li\u003e\n  \u003cli\u003eLess heat transfer reduces vaporization at the carburetor venturi and bowls.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this spacer fit my Holley 4150\/4160 or similar 4-barrel carb?\u003c\/h3\u003e\n\u003cp\u003eYes — it is built for square-bore 4-barrel carburetors with the Holley-style bolt pattern and flange dimensions. It’s compatible with many aftermarket carbs sharing that square flange layout.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits Holley 4150 and 4160 flange patterns directly.\u003c\/li\u003e\n  \u003cli\u003eWorks with Barry Grant, Carter and Edelbrock square-bore carbs that match the pattern.\u003c\/li\u003e\n  \u003cli\u003eSuitable for many SBC, BBC and big-block Ford and Mopar intake manifolds with matching flange spacing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance changes should I expect from the open 1\" design?\u003c\/h3\u003e\n\u003cp\u003eThe spacer’s open center increases plenum volume and changes the airflow path into the carburetor. That generally favors improved high-rpm airflow, while the open layout tends to preserve mid- and top-end power characteristics.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOpen design increases plenum volume for higher-rpm breathing.\u003c\/li\u003e\n  \u003cli\u003eHelps fine-tune midrange response depending on carb and camshaft setup.\u003c\/li\u003e\n  \u003cli\u003eMay require minor jetting or tuning adjustments after installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat comes in the box and how is the spacer installed?\u003c\/h3\u003e\n\u003cp\u003eThe product ships complete with mounting hardware and two gaskets. Installation is straightforward for anyone familiar with carburetor removal and mounting — tighten to proper torque and follow gasket sealing best practices.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes one 1\" black phenolic spacer, two gaskets and mounting bolts.\u003c\/li\u003e\n  \u003cli\u003eInstall between intake manifold and carburetor using supplied gaskets.\u003c\/li\u003e\n  \u003cli\u003eTorque bolts evenly to manufacturer torque specs to avoid warpage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\nThis spacer is ideal for engine builders, restorers and performance enthusiasts looking to tune inlet characteristics without permanent manifold modification. It’s best suited to street\/strip and track builds using square-bore 4-barrel carburetors where added plenum volume and reduced heat transfer are desired. Avoid using this spacer on carburetors or manifolds that do not share the Holley-style bolt pattern or square-bore flange; confirm fitment before installation to ensure compatibility and safe operation.\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 spacer fit Holley 4150 and 4160 carbs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It fits square-bore Holley 4150\/4160 flange patterns and similar square-bore 4-barrel carbs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will I need new jets after installing the spacer?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Not always. Some setups require minor jetting or tuning adjustments depending on cam, intake and engine state of tune.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SHLPDFM","offers":[{"title":"Default Title","offer_id":48082900091038,"sku":"B0B48PC5LR","price":52.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/shlpdfm-front-view-spacer.jpg?v=1785818874","url":"https:\/\/northtrailauto.ca\/products\/shlpdfm-carburetor-spacer-1in-black-phenolic-open-for-holley-4150-4160-adds-plenum-volume-reduces-heat-transfer","provider":"North Trail Auto","version":"1.0","type":"link"}