{"product_id":"zlsctt-carburetor-spacer-1-ported-phenolic-4-hole-insulates-and-improves-throttle-response","title":"ZLSCTT Carburetor Spacer 1\" Ported Phenolic 4-Hole - Insulates and Improves Throttle Response","description":"\u003cp\u003e\u003cstrong\u003eZLSCTT's 1\" ported phenolic carburetor spacer raises and insulates a 4‑hole square‑bore carburetor to improve throttle response and reduce heat soak.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis 1‑inch, four‑hole spacer is molded from phenolic resin to sit between your intake manifold and a 4150\/4160 style 4‑barrel carburetor (compatible with common SBC and BBC setups). By adding distance and thermal isolation between the hot intake and the carburetor, the spacer helps preserve a cooler, denser air\/fuel charge while providing a slight plenum effect that can improve midrange torque and throttle feel. The kit ships with two gaskets and four mounting studs and nuts to simplify installation on most square‑bore applications.\u003c\/p\u003e\n\n\u003ch3\u003eHow does a 1\" phenolic spacer affect engine temperature and fuel density?\u003c\/h3\u003e\n\u003cp\u003eThe phenolic material has low thermal conductivity, which reduces heat transfer from the intake manifold into the carburetor. Cooler carburetor temperatures help the air\/fuel mixture remain denser and less prone to vapor lock under heavy load or high under‑hood temperatures.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e1\" thickness provides measurable insulation between manifold and carburetor\u003c\/li\u003e\n  \u003cli\u003ePhenolic resin resists heat transfer better than aluminum\u003c\/li\u003e\n  \u003cli\u003eDenser charge can improve combustion consistency at cruise and part throttle\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this spacer fit my 4150\/4160 or square‑bore carburetor?\u003c\/h3\u003e\n\u003cp\u003eThe spacer is a four‑hole ported design compatible with most 4150\/4160‑style square‑bore carburetors and common SBC\/BBC manifolds. It is intended for use with widely available brands and aftermarket 4‑barrel carbs that use the 4‑bolt flange pattern.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWorks with many Edelbrock, Barry Grant\/Demon, and similar square‑bore carbs\u003c\/li\u003e\n  \u003cli\u003eDesigned for standard 4‑hole flange bolt patterns used on SBC and BBC engines\u003c\/li\u003e\n  \u003cli\u003eIncludes gaskets, studs and nuts for straightforward mounting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does porting and the 4‑hole layout influence performance?\u003c\/h3\u003e\n\u003cp\u003eA ported 4‑hole spacer aligns with the four throttle bores to maintain airflow balance while adding a small plenum volume. This can smooth transitions between throttle openings and help midrange torque without drastically altering carb tuning.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePorted openings match the carburetor bores to keep flow paths direct\u003c\/li\u003e\n  \u003cli\u003eAdded plenum effect can enhance throttle response and cylinder fill\u003c\/li\u003e\n  \u003cli\u003eMaintains even distribution across all four bores for consistent performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat comes in the box and what are the installation basics?\u003c\/h3\u003e\n\u003cp\u003eThe package contains the 1\" phenolic spacer, two matching gaskets, and four mounting studs with nuts to secure the assembly. Installation is a simple gasket‑and‑stud swap on most standard manifolds but always follow torque specs and check for vacuum\/pressure leaks after assembly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncluded: 1 spacer, 2 gaskets, 4 studs and nuts for secure fitting\u003c\/li\u003e\n  \u003cli\u003eInstall between intake manifold and carburetor using supplied gaskets\u003c\/li\u003e\n  \u003cli\u003eVerify flange alignment, torque properly, and inspect for leaks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? This ZLSCTT 1\" 4‑hole phenolic spacer is aimed at street and weekend performance enthusiasts running square‑bore 4‑barrel carburetors on small‑block or big‑block Chevy, Ford, or Mopar applications who want reduced heat soak, improved midrange response, and an easy bolt‑on upgrade. It’s ideal if you need a compact spacer that preserves carb compatibility and includes all mounting hardware for a quick swap. Note: final tuning and jetting may be required after installation to optimize air\/fuel ratios for your engine and driving conditions.\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: Is this spacer compatible with Edelbrock 4150 carburetors?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—this 1\" ported phenolic spacer fits most 4150\/4160‑style square‑bore carburetors including many Edelbrock models.\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: You may need minor jetting adjustments; cooler, denser air can change fuel requirements, so check mixture and performance after installation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ZLSCTT","offers":[{"title":"Default Title","offer_id":67589355831481,"sku":"B0FSZQLWTJ","price":73.38,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/zlsctt-front-view-spacer.jpg?v=1790529892","url":"https:\/\/redleafauto.ca\/products\/zlsctt-carburetor-spacer-1-ported-phenolic-4-hole-insulates-and-improves-throttle-response","provider":"Redleaf Auto","version":"1.0","type":"link"}