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King Engine Bearings MB509SI Main Bearing Set for Chevrolet 400 Small Block

(GMC G2500 1979-80, K1500 1979-80, C1500 1979-80, K2500 1979-80, Jimmy 1975-79, C3500 1979, K2500 Suburban 1979-80, K3500 1979-80, C2500 1979 + 59 more models)

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

MB509SI
4 reviews
Sale Price

$35.22

In Stock (10+)

delivery box

Usually delivered within 2 days

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Product Details

The King Engine Bearings MB509SI is a precision-engineered main bearing set designed for Chevrolet 400 cubic inch small block V8 engines. This complete set includes 5 pairs of bearings featuring King's advanced SI (Silicon/Aluminum) bi-metal construction.

Key Features:

  • Bi-metal construction with aluminum silicon alloy base material (2.5-3% silicon content)
  • Lead-free design prioritizing environmental sustainability and safety
  • Standard size crankshaft bearing with 1/2 groove oil distribution pattern
  • Silicon particles help smooth crank surface irregularities during operation, reducing friction and wear
  • Superior debris resistance—hard particles flush through rather than embedding and scoring the crankshaft
  • Ideal for medium-load applications and engines using nodular cast iron crankshafts
  • OE replacement bearing suitable for street performance and daily driver engines

King's SI Series bearings represent the latest generation of their proven Alecular bearing technology, combining strength and durability with modern lead-free materials. The innovative silicon/aluminum alloy composition provides excellent conformability and wear characteristics, making these bearings an ideal choice for both engine rebuilds and performance upgrades.

Products specifications

Fits

GMC G2500 1979-80, K1500 1979-80, C1500 1979-80, K2500 1979-80, Jimmy 1975-79, C3500 1979, K2500 Suburban 1979-80, K3500 1979-80, C2500 1979, K1500 Suburban 1979-80, C15 1976, 1978, G3500 1979-80, C2500 Suburban 1980, G1500 1979 + 54 more models

Bearing Material

Bi-metal, silicon aluminum

Bearing Usage

Direct replacement

Groove Location

Upper

Groove Style

1/2

Grooved Bearing

No

Quantity

Sold as a set of 5.

Undersize

STD

Material

bimetal (aluminum silicon base)

Flange Oversize

FL STD

Prop 65

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

Title

King Bearings

Best price I could find on the web even after paying for shipping! Shipped in a couple of days and great service!

Fast and easy transaction.

This is a great e-retailer. Best price and fast shipping. I ordered a bike rack. Their price was the lowest I could find, and it was drop shipped from the manufacturer the following day, and arrived in time for me to use it on the weekend. The one criticism I would have is the item description could have been better. From my web research, I knew the model I wanted, but if I was just browsing bike racks on their website, I would have needed more information.

Wow super fast shipping and I ordered over a holiday weekend. Will be doing business with this site again soon.

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