SOASEMBE Carburetor Adapter for Edelbrock to Q-Jet 0.85in Aluminum 4‑bbl spacer with gaskets & hardware

This kit lets you mount a square‑bore (Performer/Thunder series) carburetor on vehicles with Rochester Quadrajet or Thermo‑Quad spread‑bore manifolds without replacing the intake or buying a new carb. The machined aluminum plate preserves air flow while providing the correct hole pattern and hardware to secure both carburetor and intake reliably. It ships as a complete installation set, including both gaskets, studs, bolts, nuts and lock washers so you have everything to install quickly.

How does this adapter bridge square and spread bore patterns?

The adapter's underside matches the spread‑bore manifold flange while its top deck provides a square‑bore flange for the Edelbrock carb. Internal venturi openings are aligned and smoothed to reduce turbulence between carb and manifold. The result is secure mounting and a direct airflow transition without custom fabrication.

• Aluminum construction with machined ports for smooth flow
• 0.850" thickness for proper spacing
• Pre‑drilled holes and tapped threads for carb studs
• Included gaskets seal both square and spread flanges

Will the kit include all fasteners and gaskets I need?

Yes — the SOASEMBE kit is packaged as a full retrofit set so you won’t need to source additional hardware. Fasteners are sized to fit the adapter, carburetor and intake for a hassle‑free swap and correct clamping load.

• 1 aluminum adapter plate (Edelbrock 2696 pattern)
• 2 flanged gaskets: square‑bore and spread‑bore
• 4 carb studs (5/16" x 1-1/2"), 4 nuts and 4 lock washers
• 4 fillister head bolts (5/16" x 3/4") to secure adapter to intake

What performance or fit differences should I expect after installation?

The adapter preserves a smooth airflow path from carb to manifold while adding a short spacer height. Drivers often notice crisper throttle response and improved manifold signal at idle compared with poorly matched connections, though gains vary by combination and tuning.

• Smoother intake transition thanks to machined openings
• 0.85" spacer height can influence idle and midrange tuning
• Secure threaded mounting reduces leaks and movement
• Compatible with many GM and domestic V8 spread‑bore installations

Is this adapter legal for older emissions systems?

The plate is boxed with standard hardware and gaskets; specific emissions legality depends on vehicle, engine and local regulations. Some historical applications identify compatibility with pre‑1981 non‑feedback GM V8 setups when used with certain carb models.

• Check local and federal emissions rules before installation
• May be emissions‑legal in specified older GM configurations
• Not a substitute for modern emissions controls on newer vehicles

Who this is for: Enthusiasts swapping carburetors or restoring older domestic V8s who need a straightforward, bolt‑on solution to mate Edelbrock square‑bore carbs with Quadrajet or Thermo‑Quad spread‑bore manifolds. It’s ideal for street rods, restorations and performance projects where retaining the stock manifold or a specific carb is preferred over chasing replacement intake pieces.