{"product_id":"thundermingo-quadrajet-4-bbl-carburetor-electric-choke-750-cfm-direct-replacement-for-chevy-305-350-1904r-1906r-pre-jetted","title":"THUNDERMINGO Quadrajet 4-BBL Carburetor Electric Choke — 750 CFM Direct Replacement for Chevy 305\/350 (1904R\/1906R, Pre-Jetted)","description":"\u003cp\u003e\u003cstrong\u003eTHUNDERMINGO’s new Rochester-style Quadrajet 4-BBL carburetor is a direct-replacement electric-choke unit designed to fit 1980–1989 Chevy small-block 305 and 350 V8 engines and most applications that originally used 1904R\/1906R Quadrajets.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement carburetor reproduces the Quadrajet 4MV electric-choke design with a roughly 600–800 CFM flow range (commonly rated at 750 CFM) and comes pre-jetted for many stock configurations. It is built to replace GM part numbers 1904R and 1906R on passenger cars and light trucks from the early-to-late 1980s where the Chevrolet bowl entrance and linkage style are used. The unit is supplied fully assembled and tested but does not include electrical plugs or AC throttle kick-up hardware.\u003c\/p\u003e\n\n\u003ch3\u003eWill this carburetor fit my Chevy 305 or 350 engine?\u003c\/h3\u003e\n\u003cp\u003eIf your vehicle originally used a Rochester Quadrajet 1904R or 1906R with an electric choke and the Chevy-style bowl entrance and linkage, this THUNDERMINGO unit is intended as a direct fit. Confirm the factory part number and physical mounting style before ordering to avoid compatibility issues.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned to replace 1904R \/ 1906R Quadrajet 4MV electric choke units.\u003c\/li\u003e\n  \u003cli\u003eFits many 1980–1989 Chevrolet 305 and 350 c.i. V8 installations.\u003c\/li\u003e\n  \u003cli\u003eCompatible with EGR-equipped systems when the original used EGR.\u003c\/li\u003e\n  \u003cli\u003eNot suitable for computer-controlled fuel systems or marine use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key specifications and pre-installed jet sizes?\u003c\/h3\u003e\n\u003cp\u003eThe THUNDERMINGO Quadrajet is engineered to operate in the 600–800 CFM band, with most examples set near 750 CFM for stock small-block applications. The factory pre-installed jets and components give a baseline tune suitable for many 305\/350 setups, but tuning is often necessary after installation to match intake\/exhaust and camshaft changes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTypical flow range: 600–800 CFM (most commonly 750 CFM).\u003c\/li\u003e\n  \u003cli\u003eMain jets: 190; Idle jets: 120; Air correction jets: 190.\u003c\/li\u003e\n  \u003cli\u003eAuxiliary venturi ≈ 7 mm; choke tube (venturi) ≈ 31.7 mm; needle valve size: 3.3.\u003c\/li\u003e\n  \u003cli\u003eElectric choke-equipped and ready to be wired; no electrical plug included.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I know about installation, tuning, and limitations?\u003c\/h3\u003e\n\u003cp\u003eThe carburetor ships fully assembled and has been bench-tested, but it does not include installation instructions. Basic mechanical skill and a few specialty tools are recommended; you may prefer a professional mechanic for final tuning and adjustment. This product is not intended for computer-controlled engines, and it lacks the AC kick-up assembly and wiring connectors that some late-model vehicles used.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNo written installation instructions included; use reputable online guides or a mechanic.\u003c\/li\u003e\n  \u003cli\u003eTuning (idle mixture, float level, choke calibration) may be required after install.\u003c\/li\u003e\n  \u003cli\u003eNot for computer-controlled fuel systems or marine applications.\u003c\/li\u003e\n  \u003cli\u003eVerify carburetor size and linkage style match your existing unit before purchase.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I confirm this is the right replacement and prepare before buying?\u003c\/h3\u003e\n\u003cp\u003eMeasure and compare your current carburetor’s throttle linkage, bowl entrance, and mounting flange to the Rochester Quadrajet 1904R\/1906R pattern. Cross-reference OEM part numbers and note whether your vehicle uses EGR and an electric choke to ensure compatibility. If you need wiring plugs or AC kick-up hardware, plan to source those separately.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompare OEM part number (1904R\/1906R) and physical mounting details.\u003c\/li\u003e\n  \u003cli\u003eCheck for Chevy-style bowl entrance and linkage orientation.\u003c\/li\u003e\n  \u003cli\u003eConfirm whether your vehicle uses EGR and electric choke functionality.\u003c\/li\u003e\n  \u003cli\u003eOrder missing electrical connectors or throttle kit parts if required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: The THUNDERMINGO Rochester Quadrajet replacement is aimed at classic Chevy owners, restoration shops, and DIY mechanics who need a direct-replacement 4-BBL electric-choke carburetor for 1980–1989 small-block 305\/350 V8 engines originally equipped with 1904R\/1906R Quadrajets. It’s ideal for projects that require a stock-style carburetor footprint and performance baseline, provided the vehicle is not computer-controlled and the buyer is prepared to handle final tuning or enlist a professional for precise setup.\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 replace Rochester 1904R\/1906R carburetors?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It is made as a direct replacement for Rochester Quadrajet 1904R\/1906R electric-choke 4-BBL units on compatible Chevy applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will it work on computer-controlled vehicles or marine engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. It is not recommended for computer-controlled fuel systems or marine use; intended for automotive carbureted applications only.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"THUNDERMINGO","offers":[{"title":"Default Title","offer_id":48081929502878,"sku":"B0FK4SY335","price":282.5,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/thundermingo-front-view-quadrajet-4bbl.jpg?v=1785810095","url":"https:\/\/northtrailauto.ca\/products\/thundermingo-quadrajet-4-bbl-carburetor-electric-choke-750-cfm-direct-replacement-for-chevy-305-350-1904r-1906r-pre-jetted","provider":"North Trail Auto","version":"1.0","type":"link"}