Mercury MerCruiser Quicksilver Exhaust Manifold End Cap Gasket 480431
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Mercury MerCruiser Quicksilver 480431 is a genuine OEM exhaust manifold end cap gasket used on select MerCruiser exhaust manifold and cooling-system service applications. Current Mercury parts references identify the full gasket part number as 27-480431, with earlier 27-48043 / 48043 superseded to 480431. This gasket is used where the exhaust manifold end cap needs a proper sealing surface during repair or reassembly.
Key Features
- Genuine Mercury Marine / Quicksilver OEM gasket.
- Part number 480431 / 27-480431.
- Identified as an exhaust manifold end cap gasket.
- Supersedes earlier gasket number 48043 / 27-48043.
- GTIN / UPC: 745061155732.
- Approximate shipping dimensions: 3.78" x 3.78" x 0.25".
- Approximate shipping weight: 0.01 lb.
- Used in MerCruiser exhaust manifold / elbow and end-cap service layouts.
Engine Compatibility
The strongest supportable fitment for 480431 is MerCruiser exhaust manifold end cap service across many legacy MerCruiser gasoline engines. Current where-used references include applications such as:
- 120 / 2.5L GM 153 I/L4
- 140 / 3.0L GM 181 I/L4
- 165 GM 250 I/L6
- 200 GM 292 I/L6
- 470 Mercury 224 I/L4
- Select older GM 305, 327, 350, 427, 454, and 482 V8 MerCruiser applications
- Select exhaust manifold, elbow, cooling-system, and gasket-set component diagrams where this end cap gasket is specified.
Serial Number Fitment Notice
Verify fitment by exact engine serial number and the correct MerCruiser exhaust manifold / end cap parts diagram before ordering. This gasket appears across many older MerCruiser engine families, and exhaust manifold layouts can vary by engine model, year range, cooling configuration, and manifold design.
When This Part Needs Replacement
Replace this gasket when the exhaust manifold end cap is removed, when the existing gasket is torn or compressed, or when there is leakage at the end cap sealing surface. Reusing an old exhaust manifold gasket can lead to sealing issues and repeat labor, especially on older cast manifold assemblies.
Installation Notes
Clean the manifold and end cap mating surfaces before installation. Confirm the correct gasket position in the parts diagram, inspect the end cap and fasteners for corrosion or pitting, and replace any related hardware or sealing parts that are no longer serviceable. This gasket should be matched by part number and diagram callout rather than by shape alone.
Alternate / Superseded Part Numbers
480431 / 27-480431 is the active Mercury gasket number. Earlier related numbers include 48043 / 27-48043 and 27-48043-1. Some cross-reference sources also associate this gasket family with aftermarket reference 18-2832. Always confirm against the current Mercury parts diagram before substituting.
Parts Desk Insight
With exhaust manifold gaskets, the important match is the exact manifold style and end-cap diagram, not just the engine size. A quick serial-number check helps avoid mixing up similar gaskets used across older MerCruiser manifold and elbow assemblies.
Ships in 1–3 business days for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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