Spectre carburetor adapter SPE-5772 — 2V/4V bolt-pattern converter, 7/8" die-cast aluminum with gaskets

Spectre Performance SPE-5772 is a precision die-cast aluminum carburetor adapter that lets you mount 4-barrel carburetors to 2-barrel manifolds (and vice versa) quickly and cleanly.

If you're retrofitting, upgrading, or swapping carburetors on classic or custom engines, this adapter kit provides a reliable mechanical solution without the need for manifold replacement. Built from durable die-cast aluminum, the SPE-5772 is engineered to maintain a flat, stable mating surface while including the gaskets and mounting hardware needed for a straightforward installation. It is designed for bolt-pattern conversions only and is not compatible with spreadbore manifolds.

How does this adapter work with different carburetor/manifold combinations?

The adapter acts as an intermediary plate that matches the bolt pattern and port spacing of one flange to the other. It accepts either a 4-barrel carburetor on one side and mates to a 2-barrel manifold on the other, or the reverse, depending on your application. It preserves alignment and sealing while providing the thickness necessary for correct spacing.

• Converts 4V to 2V or 2V to 4V bolt patterns
• 7/8-inch thickness provides correct deck height spacing
• Includes gaskets and mounting hardware for a complete install

Will the SPE-5772 fit my vehicle’s manifold and carburetor?

This adapter is meant for standard bolt-pattern conversions between common 2-barrel and 4-barrel configurations but will not work with spreadbore style manifolds. Check flange bolt-hole spacing and port layout against your components before ordering. If your manifold or carburetor uses an irregular pattern, this adapter may not match.

• Designed for standard 4-bolt 2-barrel and typical 4-barrel bolt patterns
• Not compatible with spreadbore manifolds or nonstandard bolt layouts
• Measure bolt centers and port openings to confirm fitment

What materials and hardware are included, and why do they matter?

The SPE-5772 is die-cast from aluminum to provide a rigid, corrosion-resistant plate that keeps sealing surfaces flat during tightening. Spectre supplies the gaskets and bolts you need so you won’t need to hunt for matching fasteners. Using quality materials reduces the chance of leaks and simplifies installation.

• Precision die-cast aluminum construction for strength and thermal stability
• Complete gasket set to prevent intake leaks
• All necessary mounting hardware included for an install-ready kit

How straightforward is installation and what should I prepare?

Installation is generally straightforward for anyone comfortable with basic engine work: remove the existing carburetor, position the adapter with its gasket, and bolt the new combination in place. Torque bolts evenly to manufacturer specs and confirm clearances for throttle linkages and fuel lines. No machining is normally required unless your specific setup has unique spacing needs.

• Basic hand tools and torque wrench recommended
• Check throttle, choke, and fuel line clearances before final tightening
• Inspect and replace any worn manifold studs or bolts during installation

Who is this for? The Spectre Performance SPE-5772 suits hot-rodders, restoration enthusiasts, and mechanics who need a dependable, off-the-shelf solution to adapt between 2V and 4V carburetor/manifold combinations. It’s ideal when you want to upgrade carburetion without changing the intake manifold, or when matching a donor carburetor to an existing manifold for performance or drivability reasons. If your intake uses a spreadbore pattern or a custom flange, verify measurements before purchase.