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Part number starting with 338 |
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Athena advantages |
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Optimized radius embossing shape |
The round shape of the embossing increases sealing on cylinder bore, oil and cooling water passages and improves spring back strength |
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Advanced stopper technology |
State of the technology enhances sealing pressure around the cylinder. Highest sealing properties in high power engines |
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Coating technology |
Designed & engineered by Athena the special coating applied on steel surfaces, improves temperature resistance & reliability of the head gasket |


ARP are a manufacturer of fasteners / bolts found in engines and drivelines, ranging from OEM replacement parts to specialty hardware for racing applications.
ARP is the world leader in fastener technology.
ARP Pro series connecting rod bolts are precision CNC-machined to exacting specifications and designed for optimum reliability. They are heat-treated and threads are rolled to provide up to ten times more fatigue strength. This makes them far superior to standard OEM fasteners in terms of durability, and fully capable of handling the extra stress of high-combustion engines.


| ENGINE BEARINGS | ||
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CON ROD BEARING SET |
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| Part# | ||
| 4B1925H |
4B1925HX |
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| Sizes | STD, 025, .25 | STD |
| Oil Clearance | Standard | + 0.001" Extra |
| Half Type | Identical Halves | |
| Material |
Tri-metal Hardened steel backs |
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| Min Std Shaft Size |
1.7707in / 44.976mm |
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| Max Std Shaft Size |
1.7717in / 45mm |
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| Min Std Tunnel Size |
1.8898in / 48mm |
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| Max Std Tunnel Size |
1.8898in / 48mm |
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| Max Wall at Crown |
0.0591in / 1.502mm |
0.0586in /1.489mm |
| Max Overall Length |
0.6890in / 17.5mm |
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| Notes | ||
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Diagram |
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Product detailed specification |
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Bore size |
84.50mm |
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Stroke |
89.60mm |
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JE Pistons compression ratio (CR) |
9.5:1 |
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OEM compression ratio (CR) |
10.2:1 |
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Dome volume (CC) |
-22cm3 |
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Compression height (CH) |
31.60mm |
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Pin diameter |
22mm |
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Features |
Accepts Turbo and Nitrous; Ultra series |
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Fits for |
BMW - 3.0 24V Turbo (N54B30) |

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Product detailed specification |
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Model number |
REVI-28338F-3 |
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Head diameter |
30.00mm |
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Stem diameter |
5.44mm |
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Length |
108.9mm |
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Material |
Inconel |
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Fits for |
Renault 2.0 16V (F4R) |

COMETIC MLS (Multi-Layer Steel) Head Gaskets provide maximum sealing performance for today's high output engines and require no sealants. MLS gaskets are ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks. They can withstand the shearing force created by the two materials. MLS gaskets have increased strength because they are comprised of multiple layers of stainless steel; which also creates the ability to rebound and resist corrosion. The outer layers are embossed and coated on both sides with Viton (a flouroelastomer rubber based material that is heat resistant to 250 C/ 482 F). Viton is designed to meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes. The center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements.