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King Engine Bearings MB 551AM0.25 Main Bearing Set +0.25mm Oversize Toyota 3K 4K

(1968-1979 Toyota Corolla; 1981-1984 Toyota Starlet)

Part of: King Engine Bearings Main Bearing Set Oversize

Other options in this family: King Engine Bearings MB5835SI0.5 King Engine Bearings MB5280SI0.5 King Engine Bearings MB5557SI0.75 King Engine Bearings MB5770SI0.25 King Engine Bearings MB5845SI

Manufacturer

Picture for manufacturer King Engine Bearings

Part Number

MB 551AM0.25
13 reviews
Sale Price

$42.64

Estimated ship date Sunday, November 22

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Product Details

The King Engine Bearings MB 551AM0.25 is an OE-replacement crankshaft main bearing set designed for Toyota 3K and 4K engines. Built to King's AM-Series standard, this set delivers reliable performance and precise fitment for passenger car engines during routine maintenance or full engine rebuilds.

This bearing set is manufactured using King's K-783 bi-metal aluminum construction — a standard aluminum-based material equivalent to SAE-783, consisting of a steel backing bonded to an aluminum-tin-copper (Al20Sn1Cu) bearing alloy with no overlay. This construction provides an excellent balance of conformability, embeddability, and wear resistance well-suited for low to medium load engines.

Key Features:

  • AM-Series K-783 Material: Standard aluminum-based bi-metal construction, equivalent to SAE-783
  • Oversize: +0.25mm oversize for use with reground crankshafts
  • Steel-Backed Design: Steel backing with aluminum-tin-copper (Al20Sn1Cu) lining for durability and precise tolerance
  • No Overlay: Direct aluminum alloy bearing surface for low and medium load applications
  • OE Replacement Quality: Engineered to meet or exceed original equipment specifications
  • Engine Compatibility: Designed for Toyota 3K and 4K engine families

King Engine Bearings has been a trusted specialist in precision engine bearings since 1960, supplying the motorsport and automotive aftermarket with high-quality bearing solutions. The MB 551AM0.25 is an ideal choice for engine rebuilders seeking a dependable, correctly sized main bearing set for Toyota 3K/4K engine applications.

Products specifications

Fits

1968-1979 Toyota Corolla; 1981-1984 Toyota Starlet

Undersize

0.25

Material

bimetal (aluminum base)

Easy, customer-friendly online shopping. I am satisfied.

was satisfied with order

NICE

Easy enough.

GOOD SERVICE , FAST SHIPPING , GREAT PRICE !!!!!

Ordered A K&N Filter For My Bike. The Price Was The Cheapest On The Web. It Shipped Right Away. Very Happy

Easy to find and order what I needed.

There was no description with my item but the part number is correct so I'm optimistic.

shopping experience quick and easy. Free shipping a definite plus

great gui, accepts paypal

I just received my order, I was expecting it on Saturday so that was a nice surprise. I will have to install it in my car and then finish my comments. Then I will let you know the rest of the story. Thank you.

fast and easy simple as that

the amazon payment did not work; hope I don't get double billed since I went with paypal afterwards. Meanwhile, I could not verify that my amazon order is cancelled/never placed.

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