SKU: 42465956267

King Engine Bearings Main Bearing Set for 1975-1981 MG MGB (MB 520AM 030)

Sale price$83.03 Regular price$92.25
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Description

King Engine Bearings Main Bearing Set for 1975-1981 MG MGB (MB 520AM 030)Carrying on a tradition of durability and dependability, KING Bi Metal (aluminum) engine bearings feature 100% lead free aluminum silicon. King has 4 different variations of their aluminum based bearings: (AM Series) K 783 Standard aluminum based material, equivalent to SAE 783, used for low and medium load engines. King AM Series main and rod bearings are recommended for street or marine applications. They have superior embeddability, which provides

Carrying on a tradition of durability and dependability, KING Bi-Metal (aluminum) engine bearings feature 100% lead-free aluminum silicon.

King has 4 different variations of their aluminum based bearings:

(AM-Series) K-783 -Standard aluminum based material, equivalent to SAE-783, used for low and medium load engines.

King AM-Series main and rod bearings are recommended for street or marine applications. They have superior embeddability, which provides greater macro-particle and reduces scratching of the crank journals and tearing or weakening of the Babbitt overlays. The direct replacements feature tolerance control up to +/- .0001—and they're lead-free, making them environmentally friendly and user-safe. Order the King AM-Series rod bearings in the application designed for proper fitment with your vehicle.

(SI-Series) K-788 -Aluminum based material, strengthen by 2.5-3% silicon, for medium load engines or nodular cast iron crankshafts.

King SI-Series main and rod bearings are recommended for OE applications. These replacement bearings are designed for aftermarket gasoline or diesel engine rebuilding—and performance engines with factory crankshafts. The bearings have an improved crankshaft finish for reducing microscopic ferrite peaks on improperly ground or polished nodular cast iron crankshafts. King SI-Series main and rod bearings feature improved oil clearance to reduce wear and increase engine life, which in turn reduces operating noise, vibration, and excess oil flow. Order the bearing set designed for fitment on your make and model.

(SM-Series) K-789 -Aluminum alloy bonding layer. The strongest aluminum based material. The alloy is strengthened by addition of Manganese and Chromium (Mn, Cr), Used for high load applications.

For high load and performance applications, King SM-Series main and rod bearings are the strongest aluminum-based material offered by King. The alloy is strengthened by the addition of manganese and chromium. SM-Series crankshaft main bearings feature a traditional steel-backing, aluminum bonding layer, and the aluminum bearing alloy. They are available for a wide variety of vehicle and engine applications.

(HP-Series) K-787 - King HP-Series rod bearings were developed mainly for drag race applications needing a material harder than the Babbitt top layer. These applications demanded a structure that could withstand high loads for short durations and still offer higher embeddability and compatibility. In response, King developed the HP-Series featuring the Alecular metal structure.

The HP-Series is also suited for many performance applications with nodular cast iron crankshafts, such as street, strip, and some levels of Circle Track racing.

HP-Series bearings are particularly suitable for the following cases:

  • When a tri-metal bearing's Babbitt overlay extrudes over the sides, migrates to one end, or is physically removed by the crankshaft
  • When the intermediate layer of a tri-metal bearing is exposed, damaging the crank journal and requiring expensive grinding or replacement
  • When contaminants enter the oil stream, scratching and damaging the crankshaft journals


Check your bearing size using our fitment calculator here
Shipping Notes
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 42465956267

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linda earthsong
Battle Creek, US
★★★★★ 5
Great!
This SUPA MODERN Reading Pillow is absolutely what I have been searching for. I added a thick mattress topper to my twin bed and suddenly the wedge pillow I had was below the top of the mattress so I needed something else to put against the rails at the head. This reading pillow is almost exactly the same width as this standard twin. The pillow was shipped vacuum packed and looked so lumpy I was fearful it would never be comfortable but I followed the instructions and left it alone except for an occasional shake to fluff it for 72 hours. As often as I get stuff that’s vacuum packed I was still amazed by how this turned out. It’s very full and firm I’m sure some folks will like that you can remove some of the filler to soften it but I find it very comfortable as is. The shape does give it a little more lumbar support than similar pillows I have had in the past. The fabric cover is super soft but has yet to make me overheat. It does have pockets on the arms but they’re not very big I wouldn’t put much in there I was worried about falling. This is not the cheapest reading pillow but it’s far and away not the most expensive. As I was writing this review I saw that it has been marked down 20% PLUS there’s a 30% off coupon. That puts it down around the cheapest price point for a far superior pillow. Go get one NOW!!! I highly recommend this Reading Pillow!
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Reviewed in the United States on November 30, 2024
C
CYates
Birmingham, US
★★★★★ 5
Great pillow to relax with.
I ordered this pillow specifically, so my son has something to sit against when he comes to work with me. He absolutely loves it, the pockets are great, it provides enough comfort and support for him to play his video games and read while I get things done. It does need a couple of days to fully settle and puff up, and there is a bit of a smell as there is with most pillows that have this time of filling and are smooshed and wrapped in plastic. That smell goes away in the couple of days it takes for the pillow to fully expand. This pillow is great for lounging, kids sitting on the floor watching movies, to using it in bed to sit up and read, play video games or study. It also would work really well for deeper couches and shorter people. I love that the cover is washable, as that is pretty mandatory in our house with kids and pets. I am very impressed with the quality.
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Reviewed in the United States on December 27, 2024
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Cecilia
Houston, US
★★★★★ 3
Size of backrest much shorter than I wanted.
Pillow has an odor that will not go away. I have put it outside for a day and even after a week it still smells.
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Reviewed in the United States on May 24, 2025
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Jazmine
Massapequa, US
★★★★★ 4
Lounge pillow
Support: I had surgery and needed all around support with comfort.  Ease of use: The little handle on the top makes it easy to move around as needed. Comfort: The pillow is firm but also comfortable for being in one spot for a period of time.
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Reviewed in the United States on July 6, 2025
E
Verified Purchase
Es una mentira que llega antes de navidad,lo lo pedí y me dicen que llega hasta el 27 de diciembre no se porque están vendiendo algo que no pueden cumplie
Port Orchard, US
★★★★★ 1
No funcionó después de las 72 horas es mentira
No funciona,no sirve nunca se agrandó ,está defectuoso y es una mentira este cojín
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Reviewed in the United States on May 4, 2025

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