{"product_id":"auto-parts-prodigy-rochester-2gc-2-barrel-carburetor-for-chevy-350-400-large-base-3-11-16-x-2-1-16-with-hot-air-choke","title":"Auto Parts Prodigy Rochester 2GC 2‑Barrel Carburetor for Chevy 350\/400 — Large Base (3 11\/16\" x 2 1\/16\") with Hot‑Air Choke","description":"\u003cstrong\u003eDirect-fit replacement Rochester 2GC large-base carburetor for Chevy 5.7L (350) and 6.6L (400) small-block V8s with an automatic hot-air choke.\u003c\/strong\u003e\n\nThis turnkey carburetor from Auto Parts Prodigy is built to reintroduce dependable, factory-style performance to classic Chevy trucks and muscle cars from the 1970–1980 era. Engineered as the Large Base Rochester 2GC, it arrives pre-set for smooth idling and easy starting, includes a mounting gasket and fuel filter, and is intended to solve common OEM carburetor symptoms such as hard starting, rough idle, and hesitation under acceleration.\n\n\u003ch3\u003eHow do I confirm this carburetor fits my intake manifold?\u003c\/h3\u003e\n\u003cp\u003eMeasure your existing carburetor mounting bolt pattern before ordering. This listing is for the Large Base Rochester 2GC with a mounting bolt spacing of 3 11\/16\" x 2 1\/16\"; the Small Base version uses a different footprint.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMeasure center-to-center bolt distances on your intake flange.\u003c\/li\u003e\n  \u003cli\u003eLarge Base required if your pattern is 3 11\/16\" x 2 1\/16\".\u003c\/li\u003e\n  \u003cli\u003eIf your manifold measures 3 1\/4\" x 1 7\/8\", choose the Small Base instead.\u003c\/li\u003e\n  \u003cli\u003eNot compatible with 4.3L V6 S10 applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat starting and idle features are included?\u003c\/h3\u003e\n\u003cp\u003eThis carb features an integral hot-air choke assembly with a thermostatic coil inside the round black housing for reliable cold starts. A vacuum pull-off port helps prevent carburetor flooding as the engine warms, and idle mixture screws are factory pre-set for convenience.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAutomatic hot-air choke connects to stove tube heat for consistent cold starts.\u003c\/li\u003e\n  \u003cli\u003eVacuum choke pull-off port reduces bogging after startup.\u003c\/li\u003e\n  \u003cli\u003eIdle mixture screws adjustable to tune for elevation or fuel variations.\u003c\/li\u003e\n  \u003cli\u003ePre-calibrated jets aimed at typical 350\/400 small-block configurations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this restore throttle response and solve drivability issues?\u003c\/h3\u003e\n\u003cp\u003eYes — this Rochester 2GC is designed to replace worn or leaky OEM two-jet carburetors and eliminate common drivability complaints. Replacing an old unit with a properly sized, pre-set carb can noticeably reduce flat spots, surging, and erratic idle behavior when installed correctly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReplaces aging, leaking two-jet Rochester carburetors.\u003c\/li\u003e\n  \u003cli\u003eImproves throttle transition and mid-range acceleration response.\u003c\/li\u003e\n  \u003cli\u003eAddresses hard-starting and unstable idle symptoms frequently seen on vintage Chevy V8s.\u003c\/li\u003e\n  \u003cli\u003eMaintains factory-style performance without requiring major engine modifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat does the package include and what should I prepare for installation?\u003c\/h3\u003e\n\u003cp\u003eThe kit ships with the Large Base 2GC carburetor, a matching mounting-base gasket, and a new fuel filter pre-installed for immediate installation. Basic hand tools and a clean intake surface are all you need to complete the swap; you may want to have a torque wrench and some thread-safe sealant handy.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncluded: Large Base Rochester 2GC carb, mounting base gasket, pre-installed fuel filter.\u003c\/li\u003e\n  \u003cli\u003eRecommended: inspect vacuum lines, replace fuel hoses, and clean intake flange.\u003c\/li\u003e\n  \u003cli\u003eIdle mixture and minor jet tuning possible to accommodate altitude or fuel octane.\u003c\/li\u003e\n  \u003cli\u003eNot supplied: linkage clips for non-standard throttle setups or special conversion adapters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\nWho is this for?\n\nThis Rochester 2GC Large Base carburetor is aimed at owners of 1970–1980 Chevy and GMC trucks and muscle cars with small-block 5.7L (350) or 6.6L (400) V8 engines who want an authentic, reliable replacement that preserves stock drivability. It's appropriate for restorations, daily drivers, and weekend cruisers that require a direct-fit, hot-air choke-equipped unit; however, verify your bolt pattern and engine application before purchasing to ensure a correct fit.\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 carburetor fit my Chevy 350 or 400 V8?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—if your intake bolt pattern measures 3 11\/16\" x 2 1\/16\". Measure the manifold before ordering to confirm Large Base fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the choke automatic and will it improve cold starts?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It has an automatic hot-air choke with a thermostatic coil designed to use stove tube heat for easier cold starts.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Auto Parts Prodigy","offers":[{"title":"Default Title","offer_id":48081494802590,"sku":"B073V866PX","price":147.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/auto-parts-prodigy-rochester-2gc-front-view.jpg?v=1785806534","url":"https:\/\/northtrailauto.ca\/products\/auto-parts-prodigy-rochester-2gc-2-barrel-carburetor-for-chevy-350-400-large-base-3-11-16-x-2-1-16-with-hot-air-choke","provider":"North Trail Auto","version":"1.0","type":"link"}