What is the diameter of the recessed area for the wing nut?

About 1 1/2 inch. It does come with its own cast nut that looks nice and clean, much better than a wing nut IMHO.

Will this fit in my 1985 el camino with v8?

The Spectre Performance 47623 Xtraflow Air Cleaner will fit a 5-1/8" flange.

Can this fit on a 95 chevy tahoe

Yes it will fit on a throttle body.

Good morning, my question is this: does the filter work on a 4k carburetor?

Do you mean a 4 cylinder. If so yes. If you measure the mounting hole on your carb for the air filter you can be sure. Also you might need a spacer for it

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Spectre Performance SPE-47623 Xtraflow Air Cleaner

Product ID: 338985040

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Details

Product grade
Performance
Brand
Spectre
Fit type
Vehicle Fit
Product dimensions
35.6L x 35.6W
OEM part number
47623

🌀Red synthetic media for max airflow

📏5-1/8" inlet fits carb & TBI throttle bodies

⚙️Zinc plated 1-1/4" drop base boosts hood clearance

Description

🛠️ Elevate your engine’s breathability — because every detail counts!

CUSTOMIZABLE INSTALLATION - Compatible with optional air cleaner riser (SPE-4954) for clearance over fuel inlets or electric choke setups.
COMPACT YET POWERFUL DESIGN - 14" x 3" tall assembly with Extraflow filter lid maximizes air intake in a sleek profile.
ADVANCED RED SYNTHETIC MEDIA - Delivers superior filtration and airflow balance, enhancing engine efficiency and longevity.
SPACE SAVING ZINC PLATED BASE - 1-1/4" drop base design increases hood clearance without compromising style or function.
PRECISION FIT FOR PEAK PERFORMANCE - Engineered to fit carburetors and TBI throttle bodies with a 5-1/8" inlet, ensuring seamless integration and optimal airflow.

The Spectre Performance SPE-47623 Xtraflow Air Cleaner features a red synthetic media filter designed for carburetors and TBI throttle bodies with a 5-1/8" inlet. Its 14" by 3" assembly includes an Extraflow filter lid and a zinc-plated 1-1/4" drop base that enhances hood clearance. Weighing just over 2 kg, it requires a minimum of 2.9" clearance above the carburetor flange and may need an optional riser for certain fuel or choke configurations.

Specifications

Manufacturer	Spectre
Brand	Spectre
Model	SPE-47623
Product Dimensions	35.56 x 35.56 x 7.62 cm; 2.09 kg
Item model number	SPE-47623
Exterior	Machined
Manufacturer Part Number	47623
OEM Part Number	47623
Item Weight	2.09 Kilograms

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