ACL Race Series Main Bearing Set - Standard Size 4M2633HX-STD - 350Z DE 03-06
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4M2633HX-STD · ACL Race Series Main Bearing Set · Standard Size · Extra Oil Clearance VQ35DE · 350Z DE 2003 to 2006
ACL Race Series Main Bearing Set Standard Size Extra Oil Clearance – Nissan 350Z DE
4M2633HX-STD · VQ35DE · 2003 to 2006
The ACL Race Series 4M2633HX-STD is the performance builder's choice for main bearings on the Nissan VQ35DE. Identical in construction to the 4M2633H-STD but with an additional 0.001" (0.025mm) of oil clearance on a standard size crankshaft, the HX is the preferred choice for high RPM, boosted, and track applications where increased oil flow between bearing and journal is critical for protection under sustained hard use.
The "X" suffix is the only difference from the standard H-STD set same standard crank size, same F780 Trimetal construction, same ACL Race Series manufacturing quality. The extra oil clearance allows more oil to flow through the bearing, improving cooling and lubrication under the elevated loads and temperatures of a performance application.
Product specifications
| Specification | Detail |
|---|---|
| Part number | 4M2633HX-STD |
| Brand | ACL |
| Series | Race Series |
| Type | Main bearing set |
| Size | Standard (STD) |
| Oil clearance | +0.001" (0.025mm) extra over H-STD |
| Material | F780 Trimetal |
| Sold as | Set (4 bearings) |
Why ACL Race Series HX
- Extra 0.001" oil clearance increases oil flow for improved cooling and lubrication under high load conditions
- The preferred choice for high RPM, boosted, and track applications on the VQ35DE
- F780 Trimetal construction for high strength, excellent seizure resistance, and superior fatigue life
- Micron tolerance machining for consistent wall thickness, crush, and clearance across every bearing in the set
- No flash plating for improved bearing retention and maximum heat transfer
- Trusted by engine builders worldwide for circuit, endurance, and performance street applications
H-STD vs HX-STD - which do I need?
| Application | Recommended |
|---|---|
| Standard or mild street rebuild, stock crank | 4M2633H-STD |
| High RPM, boosted, or track application | 4M2633HX-STD |
| Crank at tight end of tolerance range | 4M2633HX-STD |
| Engine builder prefers tighter clearance | 4M2633H-STD |
Installation
Difficulty
Engine builder
Tools required
Engine assembly tools
Measure before you build. Always verify crankshaft journal size and oil clearance with Plastigage or a micrometer before final assembly. The HX-STD adds 0.001" extra clearance over the H-STD on a standard shaft — confirm this suits your build specification before ordering. Do not mix bearing halves from different sets.
Fitment
Nissan 350Z Z33 DE · 2003 to 2006 (VQ35DE)
Nissan Skyline V35 · VQ35DE variants
Nissan Stagea M35 · VQ35DE variants
Infiniti G35 · VQ35DE variants
Fits the VQ35DE engine only. Does not fit the 2007 to 2008 350Z HR with the VQ35HR engine. Please confirm crankshaft size and condition before ordering. Contact us if you're unsure and we're happy to help.
For a standard street rebuild on a standard size crank, see the ACL 4M2633H-STD instead. Pair with the ACL Race Series rod bearing set for a complete crank bearing refresh on the VQ35DE.
