{"product_id":"generic-br-67255-650-cfm-4-barrel-carburetor-4150-square-bore-flange-mechanical-secondary-electric-choke","title":"Generic BR-67255 650 CFM 4-Barrel Carburetor 4150 Square Bore Flange — Mechanical Secondary, Electric Choke","description":"\u003cstrong\u003eBR-67255 is a 650 CFM 4-barrel replacement carburetor with a 4150 square bore flange, mechanical secondary action, and electric choke for reliable cold starts.\u003c\/strong\u003e\n\n\u003cp\u003eThis Generic BR-67255 carburetor is built to replace Holley-style 4150 flange units and deliver street-friendly drivability with a 650 cubic feet per minute rating. It combines a die-cast aluminum body, dual inlet fuel bowls with sight glasses, and tuned jetting to suit V8 street engines that ask for easy throttle response and dependable starting in cooler conditions. The unit’s mechanical secondary design provides predictable power delivery while the electric choke simplifies cold-weather behavior.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this carburetor affect everyday driving and throttle response?\u003c\/h3\u003e\n\u003cp\u003eThe mechanical secondary design gives linear, predictable power as the secondaries open in proportion to throttle movement, which helps avoid sudden surges. The 1-11\/16\" primary bore and tuned primary\/secondary jets balance low-end torque with high-rpm airflow for street performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e650 CFM rating supports common small-block to mid-size big-block street engines\u003c\/li\u003e\n  \u003cli\u003eMechanical secondaries ensure consistent, controllable power delivery\u003c\/li\u003e\n  \u003cli\u003ePrimary #70 and secondary #74 main jets provide a balanced air\/fuel mix\u003c\/li\u003e\n  \u003cli\u003eElectric choke aids smoother cold starts without manual choke adjustments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key specifications and compatibility details?\u003c\/h3\u003e\n\u003cp\u003eDesigned with a 4150 square bore flange, this carburetor replaces BR-67255 and fits applications that accept standard 4-bolt 4150-pattern manifolds. The 4-barrel layout and 650 CFM rating make it suitable for many street builds where drivability and moderate power are priorities.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e4150 square bore flange — fits common Holley-style manifolds\u003c\/li\u003e\n  \u003cli\u003e4-barrel, 650 CFM airflow capacity for street and light performance use\u003c\/li\u003e\n  \u003cli\u003ePrimary bore: 1-11\/16\" for strong part-throttle response\u003c\/li\u003e\n  \u003cli\u003eIncludes electric choke and dual inlet fuel bowls with sight windows\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is installation and routine maintenance?\u003c\/h3\u003e\n\u003cp\u003eThe BR-67255 is designed for straightforward swap-in replacement on compatible manifolds; many bolt-on installations require only fuel line, throttle linkage, choke wiring, and a quick base gasket change. The visible sight glass fuel bowls and accessible jets simplify tuning and periodic checks.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect-fit 4150 flange reduces manifold modification needs\u003c\/li\u003e\n  \u003cli\u003eDual sight glass fuel bowls speed float level inspection and adjustment\u003c\/li\u003e\n  \u003cli\u003eAccessible jets and removable bowls for basic carb tuning and service\u003c\/li\u003e\n  \u003cli\u003eLightweight die-cast aluminum resists heat and reduces overall weight\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance or long-term benefits does this carburetor provide?\u003c\/h3\u003e\n\u003cp\u003eWith corrosion-resistant die-cast construction and straightforward mechanical systems, the carburetor balances reliable seasons of use with ease of service. The combination of electric choke and mechanical secondary gives quicker, more dependable starts and a responsive driving feel across normal street conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDurable aluminum body for heat resistance and lower weight\u003c\/li\u003e\n  \u003cli\u003eElectric choke improves start reliability in cool weather\u003c\/li\u003e\n  \u003cli\u003eMechanical secondaries lower the chance of bogging or abrupt throttle surges\u003c\/li\u003e\n  \u003cli\u003eVisible fuel sight glasses cut inspection time during maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The BR-67255 650 CFM 4150 carburetor is aimed at street-driven V8 owners and DIY enthusiasts upgrading or replacing Holley-style 4-barrel units. It suits builders who want a user-serviceable, moderately flowing carburetor with electric choke convenience and mechanical secondaries for controlled power delivery; ideal for small- to mid-displacement engines seeking dependable everyday performance without complex electronic controls.\u003c\/p\u003e\n\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this fit my Holley 4150-style intake manifold?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — it uses a 4150 square bore flange and fits most standard 4-bolt Holley-style manifolds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the carburetor include an electric choke and how does it help?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the electric choke aids easier cold starts by automatically enriching mixture until warmed.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Generic","offers":[{"title":"Default Title","offer_id":48081858789534,"sku":"B0FC1QPWX7","price":241.08,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/generic-br-67255-front-view.jpg?v=1785809915","url":"https:\/\/northtrailauto.ca\/products\/generic-br-67255-650-cfm-4-barrel-carburetor-4150-square-bore-flange-mechanical-secondary-electric-choke","provider":"North Trail Auto","version":"1.0","type":"link"}