Delco EST Distributor for Marine GM V8 5.0L 5.7L 7.4L Mercruiser Volvo OMC 805222
RM9366-3M
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Delco EST Marine V8 Distributor
Premium Replacement for GM 5.0L, 5.7L, 7.4L & 8.2L Engines
This Delco EST (Electronic Spark Timing) Distributor is a precision-engineered replacement for marinized GM V8 engines. It provides accurate ignition timing for both carbureted and fuel-injected (EFI/TBI) systems, ensuring smoother idling, improved fuel economy, and reliable high-RPM performance.
Key Features
- ✔ Direct Plug-and-Play: 4-pin and 2-pin connectors
- ✔ High-Grade Cap: Brass terminals for maximum conductivity
- ✔ Complete Assembly: Includes housing, cap, rotor, and module
- ✔ Marine Certified: Ignition protected (SAE J1171)
Technical Specs
| Engine Type: | GM V8 (Small & Big Block) |
| Cylinders: | 8 |
| Rotation: | Clockwise (Standard) |
| Ignition Type: | Electronic (EST) |
| Housing Material: | Polished Cast Aluminum |
Compatibility / Fitment Guide
| Marine Brand | Engine Application | Notes |
|---|---|---|
| Mercruiser | 5.0L, 5.7L, 7.4L, 8.2L V8 | Common on EFI & TBI Models |
| Volvo Penta | 5.0Gi, 5.7Gi, 7.4Gi, 8.2Gi | Delco-Remy Ignition Systems |
| OMC Cobra/Joint Venture | 5.0L, 5.7L, 7.4L V8 | Fits models with EST Ignition |
| Indmar / PCM | GM 305 / 350 / 454 / 502 | Direct OEM Replacement |
OEM Cross Reference
| Mercruiser | 805222A1, 805222T1 |
| Volvo Penta | 3857449, 3862014, 3854548 (Cap) |
| OMC | 986653, 3857449 |
| Indmar | 556012 |
| Sierra | 18-5480, 18-5481 |
Questions & Answers
Is this a genuine original part?
This is a premium quality aftermarket replacement part, manufactured to meet or exceed original equipment (OE) standards for fitment and performance.
How do I know if it is compatible?
We recommend checking the SKU/MPN and Cross Reference list provided above. If your original part has a 4-pin and 2-pin connector on the base, this is the correct distributor.
Does this require a special timing tool?
Yes, to set the base timing on a Delco EST system, you must use a timing shunt (bypass tool) to lock the engine into base timing mode before adjusting.
Note: Please verify your original part number against the references above before purchasing. Distributed by 4boats.co.uk.
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