liriuda Rochester Quadrajet 1901R 4‑Barrel Carburetor for Chevy 327/350/427 — 750 CFM, Manual Divorced Choke

If you're rebuilding a classic Chevy or upgrading an older V8, this liriuda Rochester Quadrajet 4MV carburetor provides a ready-to-install spread-bore solution compatible with small- and big-block Chevy engines from the late 1960s through early 1970s. Supplied complete with flange and air filter gaskets, jets, plugs and a tool for inserting plugs, the unit mirrors the original 4-barrel design used on numerous Chevy and GMC cars and trucks. It arrives with a manual divorced choke and vacuum secondaries and supports tuning across a 600–750 CFM range depending on setup.

Which engines and years will this carburetor fit?

This Rochester Quadrajet 1901R/1901-GG replacement fits a wide range of Chevy and GMC V8s used from the mid-1960s into the early 1970s, including popular small- and big-block displacements. Confirm your intake flange and throttle linkage match the spread-bore mounting pattern before ordering.

• Small blocks: 327, 350, 400 (1966–1973 coverage varies by displacement)
• Big blocks: 396, 402, 427, 454 (common 1966–1973 fitments)
• Also referenced for some Corvette applications and GM replacement part numbers 1901R / 1901-GG

How does the Quadrajet design affect driveability and fuel economy?

The Quadrajet uses small primaries and larger secondaries to balance low-speed throttle response with high-flow capability when demanded. That unequal bore arrangement yields better part-throttle behavior while still allowing ample airflow for harder acceleration.

• Smaller primary venturis improve idle stability and off-idle throttle feel
• Vacuum-actuated secondaries open smoothly under load for predictable power delivery
• Triple-venturi central float helps maintain consistent fuel control during cornering or acceleration

What hardware and tuning parts are included, and what adjustments might I need?

The carburetor ships with common gaskets, extra jets and plugs to permit initial tuning; however, you should plan on final mixture, idle and float adjustments after installation. Installation instructions are not included, so mechanics often follow service manuals or walkthrough videos when setting up the unit.

• Included: carburetor, flange gasket, air filter gasket, plug-pushing tool, 4 plugs, 8 jets
• Common adjustments: idle mixture, float level, secondary vacuum calibration
• Recommended fuel pressure: ~5–5.5 psi; add regulator if pump pressure exceeds 7 psi

Is this a direct replacement and what should I check before buying?

Yes — this liriuda Quadrajet is built to bolt onto original spread-bore GM intake manifolds as a direct replacement for compatible models. Before purchase, verify your vehicle’s original carburetor part number and that your throttle linkage, choke style and mounting pattern match a 1901R/1901-GG style unit.

• Confirm original part number or compare flange pattern with product photos
• Check choke type: this unit uses a manual divorced choke with vacuum secondaries
• Consider jet selection included for basic tuning or custom tuning needs

Who this is for: Classic Chevy and GMC owners, restorers and performance hobbyists who need a cost-effective, period-correct replacement for 4-barrel Rochester Quadrajet applications. Suitable for engines from 327 through 454 where a spread-bore Quadrajet is the intended carburetor, and ideal if you want a mostly complete kit to simplify installation and initial tuning. If you are unsure about compatibility, contact liriuda or consult a mechanic before purchase to ensure the carburetor meets your intake manifold and linkage requirements.