Engines and Components› Connecting Rods and Components

ACL Race

Race Engine Bearing Kit

$161.32

SKU: 5M1959H-STD, 4B1946H-STD, 1T1957 STD

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

This combo kit includes main bearings, rod bearings, and thrust washers.

The main bearings (Part # 5M1959H-STD) utilize a unique combination of design, metallurgy, and engineering for high-performance use. The rod bearings (Part # 4B1946H-STD) are manufactured to exacting tolerances for reliable fit and consistent clearances. The thrust washers (Part # 1T1957-STD) prevent crankshaft movement and help withstand stresses from clutch and flywheel operation.
Show original supplier description
The ACL Race Bearings combo kit provides essential Trimetal engine bearings for Honda B-Series engines, including mains, rods, and thrust washers. These high-performance bearings are engineered with a focus on durability and precise fitment to ensure optimal engine operation under demanding conditions. The main bearings (Part # 5M1959H-STD) are constructed using a unique combination of design, metallurgy, and engineering, delivering the performance drivers expect. The ACL Race Series rod bearings (Part # 4B1946H-STD) are manufactured to exacting tolerances, ensuring accurate wall thickness and consistent clearances for reliable engine function. Complementing these are the ACL thrust washers (Part # 1T1957-STD), which are critical for preventing crankshaft movement and managing stresses from clutch and flywheel operations, working in conjunction with the rod and main bearings. This kit is recommended for a variety of Honda engines, including B16A, B17A1, B18A1, B18B, B18B2, B20B, and B20Z. The application list for the main bearings also includes K20A3, K20A2, K20Z1, K24A, and K24Z1. Rod bearing applications cover the B16A, B17A1, B18A1, B18B1, B18B2, B20B, and B20Z engines. Thrust washer applications extend to B18A/B20A (SOHC only), B18C1, B18C2, B18C5, B18C7, B20A, B21A, B21A1 (DOHC only), B20B, B20Z, D16A, D16B, D16W, D16Y, D16Z, K20A3, K20A2, K20Z1, K24A, K24Z1, and K20C1.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandACL Race
Part Number5M1959H-STD, 4B1946H-STD, 1T1957 STD
CategoryEngines and Components

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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