462-02 weld on radiator neck - large

Speedflow SF462-02 | Weld-On Radiator Neck | Large | Billet Alloy

The Speedflow SF462-02 is a precision-machined large billet alloy weld-on radiator neck, designed for custom radiator and header tank fabrication where a larger filler neck diameter is required. Offering greater cap opening capacity than the small SF462-01 variant, the SF462-02 is the preferred choice for high-capacity custom radiators, large header tanks, and performance cooling systems where a full-size billet filler neck is needed. Comes complete with a removable overflow tail.

Product Specifications

• Part Number: SF462-02
• Material: Billet aluminium alloy
• Size: Large
• Type: Weld-on radiator filler neck
• Includes: Removable overflow tail
• Barcode: 9342122008016

Applications

The SF462-02 is an essential component for custom cooling system fabrication, including:

• High-capacity custom aluminium radiator fabrication requiring a large billet filler neck
• Large header tank and expansion tank fabrication for performance and race vehicles
• V8 and high-displacement engine cooling system builds requiring maximum coolant capacity
• Hot rod, street rod, and race car cooling system fabrication
• Any custom cooling system requiring a large weld-on billet alloy radiator filler neck

SF462-02 Large vs SF462-01 Small — Choosing the Right Size

The Speedflow 462 series weld-on radiator necks are available in two sizes. The SF462-01 (small) suits standard custom radiators and compact header tanks, while the SF462-02 (large) is the better choice for high-capacity radiators, large header tanks, and builds where a full-size filler opening is required for easier coolant filling and pressure cap fitment. If you are unsure which size suits your radiator cap or build, contact us with your cap diameter and we’ll help you select the correct fitting.

Why Billet Alloy?

Billet aluminium offers superior strength, corrosion resistance, and heat tolerance compared to cast or pressed alternatives — critical qualities in a radiator neck that must withstand constant heat cycling, pressure, and vibration. The machined finish provides a precise, consistent fit for radiator caps and delivers a premium aesthetic that complements quality custom fabrication work. The removable overflow tail allows flexible routing of the overflow hose to suit your specific build layout.

Sold individually. Weld-on fitment — requires TIG or MIG welding to aluminium radiator or header tank. Includes removable overflow tail.