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.
Part Number 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.
Frequently Asked Questions
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.
