Recmar MerCruiser GM V8 Thermostat Bypass Gasket 27-48818Q01 18-2844
REC27-48818Q01
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Recmar MerCruiser GM V8 Thermostat Gasket
Small- & Big-Block V8 | 27-48818Q01
Upper thermostat-cover/bypass gasket for selected MerCruiser GM V8 cooling systems, including small- and big-block engine families whose diagrams specify the 48818 profile.
Key Features
- Upper thermostat cover / bypass gasket
- For specified GM small- and big-block V8 engines
- Used across many 1978–1997 applications where listed
- Aftermarket Recmar; not genuine Quicksilver
- One gasket supplied
Technical Specs
| Part type | Thermostat cover / bypass gasket |
| Engine architecture | GM V8 small- and big-block |
| Typical era | 1978–1997 where specified |
| Quantity | 1 gasket |
| 4Boats SKU | REC27-48818Q01 |
Compatibility / Fitment Guide
| Engine / system | Application | Required check |
|---|---|---|
| MerCruiser GM small-block V8 | Selected 228, 230, 250, 260 and related engines | Parts diagram must list 27-48818Q01/488181 |
| MerCruiser GM big-block V8 | Selected 325, 330, 340, 350 and performance variants | Confirm exact upper housing and serial |
| Legacy thermostat service kits | Applications using the 48818 gasket profile | Compare passage and bolt-hole layout |
Not for inline four/six-cylinder, Ford 302/351 or every GM V8 thermostat housing. Related 27-41812 and 27-60208 profiles are not chosen solely by visual similarity.
OEM Cross Reference
| Mercury / MerCruiser | 27-48818Q01; 27-488181; 27-48818; 48818 |
| Sierra | 18-2844 |
| GLM | 31510 |
| Barr Marine | MC47-27-48818 |
| Recmar / 4Boats SKU | REC27-48818Q01 |
Cross-reference numbers identify the gasket profile and service application. This is an aftermarket Recmar component.
Questions & Answers
Will it fit every MerCruiser V8?
No. The housing must use the 48818 gasket profile.
Is it for Ford V8 engines?
No. Ford 302/351 commonly use the 60208 profile.
What is included?
One gasket only.
Can it be reused?
Replacement is recommended whenever the cover is removed.
Before ordering: confirm a GM V8 housing and 27-48818Q01/488181 in the serial-specific diagram.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
