SeaEagles Holley 4‑Barrel Carburetor Rebuild Kit 37-485 for 4150 Double‑Pumper (600–850 CFM) — Full Gasket & Pump Diaphragms

If your Holley 4150-series carburetor is leaking, hesitating, or simply due for a refresh, this SeaEagles 37-485 replacement kit supplies the commonly worn components needed to rebuild and tune the unit without buying an entirely new carburetor. Designed for gasoline 4-barrel double-pump Holley models (including many 600–850 CFM versions), the kit bundles seals, pump diaphragms, needles and seats, and power valves so you can return the carburetor to reliable operation.

What parts are included and how complete is the kit?

The kit contains the core wear items typically required for a comprehensive overhaul: full gasket sets, O-rings, accelerator pump diaphragm(s), needle and seat assemblies, and one or more power valves. Components are selected to match the common needs of Holley 4150 family carburetors so you won’t be missing small sealing parts during a rebuild.

• Full gasket set for meter and baseplates
• Multiple O-rings for shafts and fittings
• Accelerator pump diaphragm(s) and gaskets
• Needle and seat assemblies for float control
• 125–65 6-5"Hg style power valve(s)

Will this kit fit my Holley 4150 or double-pumper carburetor?

This SeaEagles 37-485 rebuild kit is made for Holley 4-barrel perf carburetors, including many 4150 and 4150C double-pumper applications and popular CFM ratings from 600 to 850. Check your carburetor model stamp and compare included parts to the worn components you see before purchasing to ensure compatibility.

• Compatible with Holley 4150 / 4150C family
• Works on 4-barrel double-pumper configurations
• Suitable for many 600–850 CFM performance carburetors

How does using this kit affect performance and drivability?

Replacing aged seals, diaphragms, and needle/seat parts restores proper fuel metering and response, which helps reduce leaks, stumble, and idle irregularities. The parts in this kit allow you to tune and return the carburetor to expected functional condition during a rebuild.

• Stops common vacuum and fuel leaks with new gaskets and O-rings
• Replaces hardened pump diaphragms for crisper throttle response
• Refreshes the needle and seat to stabilize float level and fuel flow

Are installation instructions or additional support available?

The package does not include printed instructions by default, but SeaEagles provides customer support and can supply rebuild guidance or digital instructions on request. If you need step-by-step help, contact the seller to receive the instruction materials and troubleshooting tips.

• Digital installation help available upon request
• Contact seller for part verification and fit advice
• Keep old parts for comparison during rebuild

Who is this for: The SeaEagles 37-485 rebuild kit is aimed at home mechanics, performance enthusiasts, and professional shops maintaining or refreshing Holley 4150-series 4-barrel double-pumper carburetors. If you want to renew seals, replace aged diaphragms, and restore reliable fuel metering without buying a new carb, this kit provides the essential components for a proper rebuild. It’s ideal for owners of vehicles using 600–850 CFM Holley performance carburetors who prefer a cost-effective, parts-complete replacement set and access to vendor support for instructions or fit confirmation.