{"product_id":"thundermingo-rochester-2gc-2-barrel-carburetor-for-chevy-350-400-large-base-electric-choke","title":"THUNDERMINGO Rochester 2GC 2-Barrel Carburetor for Chevy 350\/400 Large-Base, Electric Choke","description":"\u003cp\u003e\u003cstrong\u003eTHUNDERMINGO's New Rochester 2GC two-barrel carburetor is a direct-fit aftermarket replacement for many Chevy small-block 5.7L (350) and 6.6L (400) engines from the 1970s, featuring an electric choke and a large base flange.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis rebuilt-style carburetor is made to match the Rochester 2GC pattern used on numerous Chevrolet models between 1970 and 1980. It’s intended as a replacement part where the original large-base 2-barrel carburetor (3 11\/16\" x 2 1\/16\") is specified. Before ordering, verify your engine displacement and base flange dimensions — this unit will not fit small-base Rochester 2GC carbs or 305\/327 engines.\u003c\/p\u003e\n\n\u003ch3\u003eWhich Chevrolet engines and vehicles will this carburetor fit?\u003c\/h3\u003e\n\u003cp\u003eThe THUNDERMINGO Rochester 2GC is compatible with Chevy 5.7L (350 Cu) engines from 1970–1980 and 6.6L (400 Cu) engines from 1970–1975. It fits a wide selection of cars, trucks, and vans that originally used the Rochester 2GC large-base carburetor.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCommon fits: C10\/C20\/C30 pickups and Suburbans (1970–1980), Impala, Caprice, Corvette, Chevelle, Bel Air, Biscayne, Blazer, El Camino, and various G\/P models.\u003c\/li\u003e\n  \u003cli\u003eAlso fits some commercial vans and larger trucks listed for 1970–1980 model years.\u003c\/li\u003e\n  \u003cli\u003eNot compatible with 305 or 327 engines or small-base Rochester 2GC flange dimensions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key dimensions and technical specs I should check?\u003c\/h3\u003e\n\u003cp\u003eConfirming physical dimensions is crucial to ensure a proper swap. This replacement uses the large-base footprint and includes an electric choke assembly configured for common OEM mounting points.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBase flange: large-base only — 3 11\/16\" x 2 1\/16\" (check your current carburetor flange before purchase).\u003c\/li\u003e\n  \u003cli\u003eBolt hole spacing (center to center): 93.5 × 50.5 mm; intake inner diameter: 42.8 mm.\u003c\/li\u003e\n  \u003cli\u003eChoke air horn outer diameter: 78 mm; venturi diameter: 30 mm; two-barrel electric choke design.\u003c\/li\u003e\n  \u003cli\u003eOEM replacement numbers referenced: 17054616, A910, D297-CBCHV, Rochester 2GC pattern.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I know this carburetor is a correct replacement for my vehicle?\u003c\/h3\u003e\n\u003cp\u003eMatch the carburetor to your engine displacement (350 or 400), the vehicle model\/year list, and physically compare the base flange size and bolt spacing. If any of these differ, this large-base unit will not fit correctly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify engine: 5.7L (350) for 1970–1980 or 6.6L (400) for 1970–1975.\u003c\/li\u003e\n  \u003cli\u003eCompare flange dimensions against your original Rochester carburetor (large-base required).\u003c\/li\u003e\n  \u003cli\u003eCheck throttle linkage, vacuum ports, and fuel inlet orientation to confirm fitment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I expect when installing and using this carburetor?\u003c\/h3\u003e\n\u003cp\u003eThis carb is supplied as shown in product images and designed to bolt into vehicles that used the large-base Rochester pattern. Minor adjustments to idle and mixture may be needed during installation and break-in.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eElectric choke requires wiring to the vehicle’s 12V circuit through the appropriate thermal lead or harness.\u003c\/li\u003e\n  \u003cli\u003eAfter installation, set idle and mixture per your vehicle service manual for best drivability.\u003c\/li\u003e\n  \u003cli\u003eInspect gaskets, throttle return spring, and vacuum lines; replace any worn components for reliable operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This THUNDERMINGO Rochester 2GC large-base carburetor is aimed at classic Chevy owners, restorers, and mechanics rebuilding 1970s small-block 350 or 400 engines who need an aftermarket two-barrel, electric-choke replacement. It’s ideal when the original Rochester 2GC pattern is required and the large-base flange matches your intake manifold. If you’re unsure about compatibility, measure your current carburetor’s base and compare the specifications listed above or contact us with photos for confirmation.\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: Will this carburetor fit my 1974 Chevy C10 350 engine?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, it fits 1970–1980 Chevy 5.7L (350) engines when the carb has a large-base flange.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this compatible with 305 or 327 Chevy engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. This unit is not compatible with 305 or 327 engines or small-base Rochester carbs.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"THUNDERMINGO","offers":[{"title":"Default Title","offer_id":48081431822494,"sku":"B0BB649V6Y","price":127.25,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/thundermingo-front-view-carburetor_287a323c-4132-45c4-9bb8-d6ce0da7159c.jpg?v=1785804144","url":"https:\/\/northtrailauto.ca\/products\/thundermingo-rochester-2gc-2-barrel-carburetor-for-chevy-350-400-large-base-electric-choke","provider":"North Trail Auto","version":"1.0","type":"link"}