Size Chart
×
ACL 4B8351HX-STD is a connecting-rod bearing set for the cataloged Ford / Kia / Mazda ZMD, A5D, B6, BP engine configurations. STD manufacturer size designation; verify the exact engine and assembled clearance.
HX specifies 0.001 inch (0.025 mm) additional oil clearance relative to the corresponding H-STD set on the specified standard-size shaft. It is separate from any repair-size or housing-oversize designation.
ACL’s 2023 guide catalogs this rod-bearing family for Mazda B6, B6-T, BP, BP-T, ZL-VE and ZM-DE engines. B1, B3, B5 and Z5-DE use the separately listed 4B8331 rod-bearing family, even where 5M8353 main bearings are shared. Confirm the exact engine rather than assuming a common main-bearing number establishes rod compatibility.
| Manufacturer / Engine | Ford — ZMD |
|---|---|
| Manufacturer / Engine | Kia — A5D |
| Manufacturer / Engine | Kia — B6 |
| Manufacturer / Engine | Kia — BP |
| Manufacturer / Engine | Mazda — B6 |
| Manufacturer / Engine | Mazda — B6-2E/B6-ME |
| Manufacturer / Engine | Mazda — B6D |
| Manufacturer / Engine | Mazda — B6F |
| Manufacturer / Engine | Mazda — B6T |
| Manufacturer / Engine | Mazda — BJ |
| Manufacturer / Engine | Mazda — BP |
| Manufacturer / Engine | Mazda — BP-4W |
| Manufacturer / Engine | Mazda — BP-T |
| Manufacturer / Engine | Mazda — BP-Z3 |
| Manufacturer / Engine | Mazda — BP-Z3 Turbo |
| Manufacturer / Engine | Mazda — BP-ZE |
| Manufacturer / Engine | Mazda — BPD |
| Manufacturer / Engine | Mazda — ZL-VE |
| Manufacturer / Engine | Mazda — ZM-DE |
The engine-family list identifies catalog applications, not universal vehicle fitment. Confirm the exact engine version, crankshaft, rods, block and bearing location. Vehicle names and photos do not replace dimensional verification.
| Brand | ACL |
|---|---|
| Manufacturer Part Number | 4B8351HX-STD |
| Component | Connecting-Rod Bearing Set |
| Size Selection | STD manufacturer size designation; verify the exact engine and assembled clearance. |
| Catalog Rod Housing Bore (STD journal) | 47.996–48.016 mm |
| Catalog Rod Journal Diameter (STD) | 44.940–44.956 mm |
| Catalog Family | ACL Race Series |
| Half Type | Identical halves |
| Catalog Size Options | STD |
Confirm the rod-bearing set contents and shell positions against the complete manufacturer number. The photo is representative of the part family.
Measure shaft journals, housing bores and assembled oil clearance using the engine builder’s specification. Check oil-hole alignment, groove placement and crankshaft fillet clearance before final assembly. Catalog standard dimensions must not be treated as the finished dimensions for a different repair size. ACL specifies that abrasive pads or paper must not be used on the bearing surface to alter oil clearance.
Is the year and model enough to choose this bearing? No. Match 4B8351HX-STD to the exact engine and measured build specification.
What size is this listing? STD manufacturer size designation; verify the exact engine and assembled clearance.
Can I substitute a different suffix? Compare the complete grade, size, locating features and assembled clearance before substituting any bearing.
ACL 5M8353HX-STD main bearings. This separate component uses its own measured main-journal clearance; confirm the exact engine configuration and size before pairing parts.
Shop ACL engine bearings, Race Series rod and main bearings, thrust components, bushings and selected oil pumps at Black Ops Auto Works. Build your parts list around the engine you are rebuilding, then compare Race Series H, extra-clearance HX and the available repair-size configurations with your engine builder’s requirements.ACL Race Series Engine BearingsACL Race Series bearings give engine builders application-specific choices for performance engine assembly. H and HX configurations let you select the specified bearing family and oil-clearance option, with additional designs available for selected engines. The right choice starts with the planned engine build and the measured components rather than a universal bearing upgrade.Shop ACL Engine Parts Connecting-rod bearings: service the crankshaft’s rod journals with the set or individual pair specified for your engine. Main bearings: support the crankshaft in the block; compare complete sets and selective-grade listings where of...
View ACL Performance Parts Products
Engine and drivetrain bearings for domestic, import, and diesel platforms are stocked at Black Ops Auto Works. Shop main bearings, rod bearings, cam bearings, thrust bearings, wheel bearings, pilot bearings, transmission bearing kits, and differential bearing sets for HEMI 5.7, 6.1, 6.4, and 6.2 supercharged engines, LS and LT platforms, Coyote V8s, Duramax, Cummins, and Power Stroke diesels, and popular import engines like the VQ35, VQ37, VR38DETT, K20, K24, and 2JZ. Every bearing is filterable by year, make, model, engine code, and bearing clearance so the correct part ships the first time. Black Ops Auto Works carries 1250 bearing SKUs across engine internals, transmission and transfer case hardware, differential components, and wheel end assemblies. What This Category Covers Bearings are the precision-fit wear surfaces that keep an engine, transmission, and axle assembly spinning true under load. A correctly sized bearing set with the right clearance is one of the most impor...
View Bearings Products
Shop automotive engine parts, cooling-system components, oil-system upgrades, ignition parts, pulleys, sensors, gaskets, fuel components, and engine-bay accessories at Black Ops Auto Works. This collection covers vehicle-specific replacement parts, performance upgrades, supporting hardware, and universal components for street cars, trucks, SUVs, Jeeps, diesel vehicles, off-road builds, and motorsport applications. Engine Parts and Performance Components The Engine collection brings together components used throughout the engine, lubrication system, cooling system, ignition system, fuel system, crankcase ventilation, accessory drive, and engine compartment. Available products range from replacement sensors and gaskets to rotating-assembly parts, performance cooling systems, supercharger pulleys, catch cans, cylinder heads, camshafts, intake manifolds, and engine-bay dress-up components. Engine compatibility cannot be determined from vehicle model alone. Confirm the exact year, make, ...
View Engine Products
Engine block parts and internals for HEMI, Hellcat, Trackhawk, TRX, LS, LT, Coyote, EcoBoost, K-Series, VR38DETT, and Cummins diesel builds are stocked at Black Ops Auto Works. Shop main and rod bearings, engine gaskets and gasket kits, engine mounts, block off plates, block heaters, PCV valves, sleeves, engine covers, and complete engines. 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 2,187 engine block SKUs across rotating assembly, sealing, mounting, and engine bay dress-up categories. What This Category Covers The Engine Block collection groups the internal and structural components that make up the bottom end and block assembly of a performance or OEM-replacement engine. Coverage spans bearings for rotating assembly refreshes, gaskets and gasket kits for sealing rebuilds, engine mounts for swap and performance builds, and engine bay dress-up pieces for HEMI, Hellcat, and ...
View Engine Block Products
Explore Kia Rio parts for suspension work, ignition maintenance and exterior accessories at Black Ops Auto Works. Compare named KYB rear shocks and AST spring references with Granatelli wires and AVS window deflectors. Choose around actual production, body, engine and current equipment.KYB Suspension Service and AST Spring ChoicesA KYB Excel-G rear-shock title names a 2018–2022 Accent/Rio application, while AST lists its own Rio lowering-spring range. Match complete body, drivetrain and suspension coverage, then review current dampers and supporting installation or alignment needs. A protective boot or alignment shim has a separate service scope.Ignition and Engine-Service ReferencesGranatelli titles distinguish early Rio/Rio Cinco 1.6L wire applications by production range and product reference. Match the actual ignition arrangement before comparing them. NGK plugs and ACL Hyundai/Kia engine-bearing references need exact engine identity and component requirements, including builder...
View Kia Rio Parts and Accessories Products
Explore Kia Sephia parts for ignition maintenance, clutch service and smaller mechanical projects at Black Ops Auto Works. Compare named Granatelli wire choices with ACT service references and separately listed engine or alignment components. Select actual production, engine and transmission before coordinating the order.Granatelli Ignition-Wire ChoicesMPG Plus and Performance wire titles distinguish 1993–1997 1.6L, 1995–1997 1.8L and 1998–2001 1.8L Sephia applications. Match full engine and ignition coverage before comparing references. NGK plugs have their own exact component requirements and package contents to review independently.ACT Clutch-Service Pieces and Engine InquiriesACT titles explicitly name a 1996 Sephia release-bearing reference and separate alignment tools. Confirm actual transmission and clutch application and review exact contents; a service bearing or tool is distinct from a complete clutch kit. Bearing, gasket and timing-service titles naming Mazda or other veh...
View Kia Sephia Parts and Accessories Products
Explore Mazda 323 parts for suspension maintenance, brake work and engine-service inquiries at Black Ops Auto Works. Review Whiteline bush applications, Brembo rotor coverage, BMC air filters and engine-build references. Choose for your specific 323 chassis, engine and actual installed equipment.Whiteline Bushes and Suspension ServiceWhiteline titles distinguish BF and BG chassis applications, including separate front control-arm and rear-bushing positions. SuperPro control-arm references and camber-bolt options have their own detailed coverage. Match chassis, installed arm and position before comparing individual bushes, hardware and arm assemblies.Brake Rotors and Pad ApplicationsA Brembo rear-rotor title includes 1990–1991 Mazda 323 coverage alongside other models. EBC pad titles name Escort applications. Review explicit 323 production coverage, axle and installed caliper/rotor dimensions for every exact reference before comparing compounds or service contents.Engine-Build and Fi...
View Mazda 323 Parts and Accessories Products
Explore Mazda Miata parts for maintenance, suspension work and performance projects at Black Ops Auto Works. Compare DFC and Brembo brake references, Bilstein dampers, engine-service components, exhaust choices and body or interior upgrades. Keep the actual Miata generation, engine, roof/body version and brake equipment at the centre of each order.Brake Service by Generation and PackageDFC references distinguish separate NA, NB and later Miata rotor, pad, hose and hardware applications. Master-cylinder titles also distinguish ABS coverage. Match exact production, axle and installed brake dimensions before comparing compounds or kit contents; the Miata name alone does not establish one brake package.Bilstein Dampers and Chassis ProjectsDisplayed Bilstein B6 and B8 references have separate generation, position and production coverage. KYB, SuperPro, Cusco and SPL references support different damper, bush or alignment tasks. Match actual chassis and factory equipment, then review insta...
View Mazda Miata Parts and Accessories Products
Review Mazda MX-3 parts for ignition maintenance, cooling service and supporting project inquiries at Black Ops Auto Works. Compare Granatelli wire references and the Gates water-pump application, then investigate displayed brake or engine-build components for your actual equipment. Build a focused order around the exact MX-3 engine and chassis being serviced.Granatelli Ignition-Wire ApplicationsDisplayed wire titles distinguish separate MX-3 production ranges and engine labels. Match the exact reference to actual engine identity and ignition arrangement before selection. Review the full application rather than relying on the engine size printed in a short listing title; NGK plugs need their own required specification and coverage check.Gates Water Pump and Cooling ServiceA Gates water-pump title includes 1994–1995 MX-3 coverage alongside other models. Match actual engine, production and installed pump configuration before ordering. Thermostat, timing-belt and gasket references nami...
View Mazda MX-3 Parts and Accessories Products
Explore Mazda MX-5 Miata parts for cooling-system service, brake maintenance and chassis or exhaust projects at Black Ops Auto Works. Compare Mishimoto and do88 hose references, DFC and Brembo brakes, Bilstein dampers and MBRP or GReddy axle-back systems. Choose for the actual generation, engine, roof/body and equipment of your MX-5.Cooling Hoses and Engine-Service ProjectsMishimoto’s silicone-coolant-hose title names a later MX-5 production application, while do88 references distinguish ND coolant and vacuum-hose choices. Match actual engine and hose routing before selection. Boundary oil pumps and ATI dampers have separate engine, crank and accessory-drive requirements to review for a service or build order.DFC and Brembo Brake MaintenanceDFC titles distinguish different Miata generations, rotor dimensions, axle positions, hoses and master-cylinder applications. Brembo pad-and-rotor kits have their own coverage and contents. Match actual brake package and ABS configuration where r...
View Mazda MX-5 Miata Parts and Accessories Products
Explore Mazda Protege parts for brake maintenance, cooling-system service and engine projects at Black Ops Auto Works. Review EBC brake-kit applications, Gates water pumps, Granatelli ignition wires and ARP or engine-bearing references. Choose for the exact generation, actual engine and installed equipment of your Protege.EBC Brakes and Exact Package CoverageThe EBC S10 front-kit title includes 1995–1998 Protege coverage alongside other models. Other displayed pad and rotor titles name Miata or Escort applications. Match full Protege production coverage and actual brake dimensions before comparing compounds and exact supplied kit components.Gates Water Pumps and Ignition MaintenanceGates water-pump titles identify separate early Protege production ranges. Granatelli wire references distinguish different engines and years. Match actual engine, pump configuration and ignition arrangement before selection, and review NGK plug specifications independently for the exact service.ARP and E...
View Mazda Protege Parts and Accessories Products
Explore Mercury Capri parts for suspension projects, mounting service and engine maintenance at Black Ops Auto Works. Review QA1 and Whiteline references naming Capri, then choose ignition or axle components around the exact generation, engine and equipment actually installed.QA1 Rear-Suspension ProjectsThe displayed QA1 lower boxed trailing-arm title explicitly includes 1979–1986 Capri among Mustang applications. Match complete actual-body, axle and suspension-mounting coverage before choosing it. Other upper-arm references require their own explicit Capri application; review the entire arrangement and supporting hardware with your installer.Whiteline Mounts and Sway-Bar LinksA displayed Whiteline complete engine/transmission-mount title names 1984 Capri, while a fixed sway-bar-link title names 1984–1986 Capri. Match exact engine/transmission, body and installed mounting or bar arrangement independently. These title ranges do not establish coverage for every Capri generation.Granat...
View Mercury Capri Parts and Accessories Products