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ACL Race Series 5M1573HX-STD is a standard-size main bearing set with the HX extra-clearance configuration for BMW N63B44 and S63B44 4.4-liter V8 engines. Match the exact part number, engine version, crankshaft dimensions, housing bore, and required oil clearance before ordering.
Key Features
- ACL Race Series performance main bearing set
- Standard-size HX configuration with additional oil clearance
- 64.961 to 64.990 mm published shaft range by bearing position
- 70.000 to 70.019 mm published housing range
- Exact manufacturer part number 5M1573HX-STD
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 2009-2012 | BMW | 750i | Confirm N63 engine and measured clearances |
| 2013-2016 | BMW | M5 | Confirm S63 engine and measured clearances |
| 2012-2018 | BMW | M6 | Confirm S63 engine and measured clearances |
| 2011-2013 | BMW | X5 | Confirm N63 or S63 engine and measured clearances |
| 2015-2018 | BMW | X5 | Confirm N63 or S63 engine and measured clearances |
Specifications
| Brand | ACL |
|---|---|
| Manufacturer Part Number | 5M1573HX-STD |
| Component | Crankshaft main bearing set |
| Series | Race Series |
| Size | Standard |
| Clearance | HX extra-clearance configuration |
| GTIN | 9315726470237 |
What's Included
One ACL 5M1573HX-STD main bearing set in the manufacturer package. Related rod bearings, thrust components, seals, fasteners, lubricants, and machine work are not included unless expressly stated.
About ACL
ACL manufactures engine bearings for replacement, performance, and motorsport engine builds. Bearing selection requires exact part-number matching and measured assembly clearances rather than vehicle fitment alone.
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Frequently Asked Questions
What does HX mean on ACL 5M1573HX-STD?
HX identifies the extra-clearance version. A qualified engine builder must measure the crankshaft, housing, and assembled oil clearance before installation.
Does BMW vehicle fitment alone confirm this bearing set?
No. Confirm the exact N63 or S63 engine version, crankshaft, journal dimensions, housing bore, bearing position, and required clearance.
Can this bearing set be installed without machine-shop measurements?
No. Every journal, housing bore, bearing position, and assembled oil clearance must be checked with calibrated tools before final assembly.
Installation Instructions
Have a qualified engine builder inspect and measure the crankshaft and housing. Clean every oil passage and bearing seat, verify bearing orientation and oil-hole alignment, measure assembled oil clearance, follow the BMW and ACL lubrication and torque procedures, confirm free rotation, and prime the lubrication system before startup.
ACL
ACL Race Series engine bearings for Honda, Toyota, Subaru, Mitsubishi, Nissan, Ford, Chevrolet, Dodge, BMW, and Porsche engine builds are stocked at Black Ops Auto Works. Shop main bearing sets, connecting rod bearing sets, camshaft bearings, and thrust washers for HEMI, LS, LT, K-Series, VQ, VR38DETT, Coyote, and import turbo platforms. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 481 ACL SKUs across main bearings, rod bearings, camshaft bearings, and thrust washer categories. What This Brand Covers ACL manufactures performance engine bearings used in race engines across sport compact, drift, oval track, drag racing, and land speed record disciplines. The Race Series line uses a tri-metal construction with a copper-lead alloy overlay that provides load capacity, conformability, and wear resistance under the high RPM and cylinder pressure conditions of a performance engine. A...
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