NGK BPR6EFS Spark Plug 3623 for MerCruiser Volvo Penta V6 V8 Marine Engines
BPR6EFS-NGK
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NGK BPR6EFS (3623) Spark Plug
Precision Ignition for MerCruiser & Volvo Penta Marine Engines
The NGK BPR6EFS (Stock No. 3623) is a high-grade standard spark plug engineered to withstand the demanding conditions of the marine environment. Utilizing a copper core for superior heat dissipation and trivalent metal plating for anti-corrosion, this plug is a staple for modern MerCruiser, Volvo Penta, and Indmar inboard engines.
Key Features
- ✔ Tapered seat for precise cylinder head sealing
- ✔ Trivalent metal plating for anti-seizing
- ✔ Corrugated ribs to prevent electrical flashover
- ✔ Projected tip for improved throttle response
Technical Specs
| Thread Size: | 14mm |
| Thread Reach: | 18mm (.709") |
| Hex Size: | 5/8" (16mm) |
| Seat Type: | Tapered |
| Gap: | 0.8mm (.031") |
| Resistor: | Yes (5K Ohm) |
| Heat Range: | 6 |
Compatibility / Fitment Guide
| Engine Make | Model/Application | Notes |
|---|---|---|
| MerCruiser | 3.0L, 4.3L, 5.0L, 5.7L, 7.4L, 8.2L | Common in EFI and MPI models |
| Volvo Penta | Gi, GSi, GXi (GM Based V6/V8) | Verify reach requirement |
| Indmar | Monsoon, Hammerhead, LCR | Common in tournament ski boats |
| Marine Power | 3.0L L4, 5.7L V8, 7.4L V8 | Tapered seat applications |
OEM Cross Reference
| Mercury / MerCruiser | 33-816336Q, 33-816336, 33-854278 |
| Volvo Penta | 3851857, 3851858, 3858997, 3856759 |
| ACDelco | MR43LTS, 41-810, 41-932 |
| Champion | RS12YC, RS12YC6 |
Questions & Answers
Is this a genuine NGK part?
Yes, this is an authentic NGK product. NGK is the world leader in spark plug technology and is the preferred choice for major marine manufacturers.
How do I know if it is compatible?
We recommend checking the SKU (BPR6EFS) or the OEM cross-reference list provided. If your current plug is an ACDelco MR43LTS or a MerCruiser 33-816336Q, this is the correct replacement.
What makes the "P" (Projected) tip beneficial for marine engines?
The "P" signifies a projected tip, which places the spark further into the combustion chamber. This provides more effective ignition and improved throttle response, which is crucial for the high-load conditions of marine operation.
Note: Always verify your engine's specific gap requirements in the owner's manual before installation. 4boats.co.uk provides these specs for reference based on standard manufacturer data.
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