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King Engine Bearings MB5257SI0.25 Main Bearing Set Oversize GM - 0.25mm 379 V8

(GMC G2500 1983-95, Yukon 1994-97, K1500 1982-86, 1988-98, C1500 1982-86, 1988-97, K2500 1982-86, 1988-2000, Jimmy 1982-91 + 72 more models)

Part of: King Engine Bearings Main Bearing Set Oversize

Other options in this family: King Engine Bearings MB5835SI0.5 King Engine Bearings MB5557SI0.75 King Engine Bearings MB4102SI0.25 King Engine Bearings MB5280SI0.5 King Engine Bearings MB5770SI0.25

Manufacturer

Picture for manufacturer King Engine Bearings

Part Number

MB5257SI0.25
14 reviews
Sale Price

$82.12

Estimated ship date Monday, November 23

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Product Details

The King Engine Bearings MB5257SI0.25 is a precision-engineered main bearing set designed specifically for General Motors 379 cubic inch V8 OHV engines. This set features a 0.25mm (0.010") oversize specification, making it ideal for engines that have been machined for oversize bearings during rebuild or performance upgrades.

Material Construction:

  • Bi-metal construction with silicon aluminum alloy
  • Aluminum-based material strengthened with 2.5-3% silicon content
  • Engineered for medium load applications and nodular cast iron crankshafts
  • Excellent thermal conductivity and wear resistance

Key Features:

  • Precision manufactured to OE specifications with 0.25mm oversize tolerance
  • Silicon aluminum alloy provides superior strength-to-weight ratio
  • Optimized for medium load engine applications
  • Compatible with nodular cast iron crankshaft journals
  • Complete main bearing set for full engine rebuild

King Engine Bearings are manufactured using advanced metallurgy and strict quality control processes, ensuring consistent performance and reliability. This bearing set is ideal for engine rebuilders, performance shops, and enthusiasts rebuilding classic GM 379 V8 engines.

Products specifications

Fits

GMC G2500 1983-95, Yukon 1994-97, K1500 1982-86, 1988-98, C1500 1982-86, 1988-97, K2500 1982-86, 1988-2000, Jimmy 1982-91, Savana 2500 1996-2002, Savana 3500 1996-2002, C3500 1982-86, 1988-2000, K2500 Suburban 1982-86, 1994-99 + 68 more models

Flange Oversize

FL ON MAX

Material

bimetal (aluminum silicon base)

Undersize

0.25

Prop 65

WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov

Title

King Bearings

Fast

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Real easy to use

Great company to deal with. I placed an order with them (albeit an incorrect shipping address) and before you know it I'm expecting delivery in a very short amount of time. I also did have to call and attempt to correct my address error when the customer service rep let me know that all is well and set to be delivered to the correct address. I appreciate the fact that the gentleman on the other end of the phone was reassuring, courteous, and professional. I'd certainly do business with them again as the prices and customer service can't be beat!

Let's see how quick it arrives

Easy to use website, great communication, and product was exactly as described.

Great Prices!

Quick shipping, low price, easy website. Thanks guys!

I am not sure yet, I have not installed the product.

Wow Autoplicity beat eBay, Amazon and others by 10%!<br>Lowest price I could find on the net. They answered the phone immediately to confirm my Airaid filter was in stock and shipped it out same day. Very satisfied.<br>

very good so far

Nice prices

Phone service was quick and personable wanting to solve my problem immediately. The weight of my package was wrong causing shipping to be $300 to ship a gas can but was fixed right away. Prices were great! I would purchase through them again!

Great customer service and communication. Would buy again and again. Thanks a lot

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