Barr MerCruiser Legacy GM V8 Lower Thermostat Housing MC-29-78985
BAMC29-78985
- Dispatched in 2-3 days
- 30 Day Return Policy
- Low stock - 3 items left
- Backordered, shipping soon
Barr MerCruiser GM V8 Lower Thermostat Housing
Legacy 325 / 330 / 350 Series | MC-29-78985
Barr Marine replacement lower thermostat housing for selected legacy MerCruiser GM V8 cooling systems using the 78985 casting design.
Key Features
- Lower thermostat housing for legacy GM V8 applications
- Barr Marine replacement casting
- For specified 325/330/350 and related model groups
- Application determined by 78985 housing profile
- Bare housing unless other components are pictured
Technical Specs
| Part type | Lower thermostat housing |
| Engine architecture | Legacy GM V8 |
| Common model groups | 325 / 330 / 350 and related |
| Brand | Barr Marine |
| 4Boats SKU | BAMC29-78985 |
Compatibility / Fitment Guide
| Engine / system | Application | Required check |
|---|---|---|
| MerCruiser 330 GM | Selected V8 inboard/sterndrive applications | Parts diagram must specify 78985 housing family |
| MerCruiser 325 / 350 | Selected legacy GM V8 applications | Confirm upper cover and lower gasket interfaces |
| Related legacy V8 models | Some 370/400-design cooling systems where catalogued | Do not infer fitment; verify exact diagram |
| Replacement service | Existing Barr/Mercury housing matching MC-29-78985 | Compare casting and every hose port |
Not for GM inline engines, modern 4.3/5.0/5.7L center-riser systems or Ford 302/351 engines. Thermostat, upper cover, gaskets, drain plugs and fittings are separate unless pictured.
Part Number Cross Reference
| Barr Marine | MC-29-78985; BAMC29-78985 |
| Mercury housing family | 78985 — confirm suffix in parts diagram |
| 4Boats SKU | BAMC29-78985 |
Cross-reference numbers identify the housing design; verify the complete cooling-system diagram before ordering.
Frequently Asked Questions
Will it fit every MerCruiser V8?
No. It must use the legacy 78985 lower-housing design.
Is this the upper cover?
No. It is the lower housing.
Are fittings included?
Only components clearly shown in the product images are included.
How do I verify it?
Compare casting, ports and the exact serial-specific parts diagram.
Before ordering: match the removed lower housing and 78985 application before purchase.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
