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ACL Race Series Main Bearings are engineered for high-performance Mazda and Ford applications, offering the durability and precision required for motorsport and high-RPM builds. Designed with a tri-metal structure and performance-enhancing features, these bearings deliver consistent oil clearance, improved fatigue strength, and optimal support under extreme load.
Key Features
Trimetal construction with reduced-thickness overlay for superior fatigue resistance
Standard (STD) size; available in undersizes (.025, .25, .50)
Hardened steel backing for improved bearing retention
Increased crush and eccentricity to handle bore distortion at high RPM
Flash plating eliminated to enhance heat transfer
3/4 groove design to improve oil flow and load surface area
Tight wall tolerances for consistent oil clearance
Enlarged chamfers to fit performance crankshafts
Direct-fit lower-half set for quick installation
Technical Details
Bearing Type: Main Bearings
Size: Standard (STD)
Tunnel Diameter: 53.998 – 54.018 mm
Shaft Diameter: 49.938 – 49.956 mm
Max Wall Thickness: 2.013 mm
Max Length: 17.63 mm
Half Type: Lower
Weight: 0.23 kg
Fitment Information
Compatible with a wide range of Mazda and Ford 4-cylinder engines from the B-series and Z-series families, including:
Mazda MX-5 Miata – BP-ZE, BP-4W, BP-Z3, BP-Z3T
Mazda 323 / Protege – B6T, B6D, B6, B5, B3, BPD, BP-T, BP, Z5-DE, ZL-VE, ZM-DE
Mazda 121, Meteor – B1, B3, B5-ME, B5-MI
Ford Capri, Laser, Festiva – Mazda B6T, B6D, B6Y, B5, B3
Kia Mentor – Mazda B5-ME, B5-MI (shared platforms)
Note: Always confirm crankshaft and block specifications for precise fitment.
What’s Included
(1) Set of ACL Race Series standard-size main bearings (lower halves only)
We are open Monday-Friday from 8am-6pm EST
Yes, customers located in and around the the Piedmont area are welcome to pick up their items from our retail location during normal business hours. Our address is:
Elite Race Fab
1514 Holbrook St Suite D-F
Greensboro, NC 27403
Elite Race Fab offers free ground shipping & handling to our retail customers within the lower 48 contiguous United States on most orders totaling $159.99 and higher, when the item being purchased is not a Freight/LTL item! Orders under $159.99 will be subject to a nominal $13.99 Flat shipping charge. Some exceptions and/or exclusions apply, in those scenarios you will be advised of any additional charges in the item details/description stating shipping exclussions/freight shipping required etc.
In regards to expedited and international shipping each order will need to be quoted on a case by case basis. You can obtain a quote two ways:
- From your shopping cart select "Request a Quote" prior to placing your order. We will review your proposed order and promptly respond with shipping estimates.
- Complete your order ahead of time indicating either expedited or international shipping during the checkout process. We will promptly determine shipping rates for your order and email you for approval and additional payment.
-Give us a call and we can ensure your item is shipped right then, to ensure you have it in time for your deadline.
We have been committed to offering all of our customers the lowest pricing throughout our website day in and day out. We value your business so much that we go a step further than our competitors. We use a third party software that proactively monitors all our competitor's websites/pricing so that we can make adjustments accordingly if needed to have the lowest prices. Thats right, no need to spend hours searching for the lowest prices, as ours will be the lowest.
As far as price matching, we dont want to write a check we cant cash, but we certainly want to earn your business. With that said, we will go above and beyond to match our competitor's pricing when it is needed. Simply email us, click the live contact button, or give us a call and be sure to have a link to our competitor's site and please factor in any shipping and handling their website will be charging. We will then ensure you get the lowest price, and either match or beat their pricing.
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