Manifold & Riser Set for Mercruiser 7.4L & 8.2L Big Block
RMBBSET
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- 30 Day Return Policy
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MerCruiser Big Block Manifold & Riser Set
Premium Aftermarket Solution for 7.4L & 8.2L V8 Engines
Renew your engine's exhaust system with this comprehensive heavy-duty kit. Specifically engineered for MerCruiser Big Block Chevy (BBC) applications, this set provides a direct-fit replacement for aged or corroded exhaust components, ensuring optimal water flow and exhaust gas discharge.
Key Features
- ✔ Complete Kit: Includes Manifolds, Risers, Gaskets, and Bolts
- ✔ Direct OEM fitment for easy installation
- ✔ Heavy-duty cast iron construction
- ✔ Precision-ground mounting surfaces
Technical Specs
| Material: | Cast Iron |
| Exhaust Outlet: | 4" (102mm) |
| Engine Type: | V8 Big Block Chevy |
| Joint Type: | Standard Wet-Joint |
| Color: | Black Primed |
Compatibility / Fitment Guide
| Make/System | Model/Application | Notes |
|---|---|---|
| MerCruiser | 7.4L (454 cid) V8 | 1986 - 2002 |
| MerCruiser | 8.2L (502 cid) V8 | Magnum, Bluewater, Horizon |
| MerCruiser | 454 Mag / 502 Mag | Wet-Joint Systems only |
OEM Cross Reference
| Manifold OEM | 807078A6, 807078T08, 807078A2, 807078A4, Sierra 18-1953-2 |
| Riser/Elbow OEM | , 807988A03, 807988Q03, 44354A3, Sierra 18-1976-1 |
| Kit Reference | RMBBSET, Barr MC-1-807078, GLM 51240 |
Questions & Answers
Is this a genuine original part?
This is a premium quality RecMar aftermarket replacement set, precision-engineered to meet or exceed original equipment (OE) standards for durability and performance.
How do I know if it is compatible?
We recommend checking the SKU (RMBBSET) and the provided cross-reference numbers. This kit is designed for the 4-inch exhaust outlet common on Big Block 7.4L and 8.2L engines.
Are the gaskets and bolts included in the price?
Yes, this is a complete installation set. It includes 2x manifolds, 2x risers, all necessary gaskets, and the mounting hardware required for a standard swap.
Note: Please verify your engine's riser outlet diameter (4") before purchasing to ensure perfect fitment. For any technical queries, contact the team at 4boats.co.uk.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
