Home / Shop / King SI-Series Main Bearings MB 509SI Bearings, SI-Series, 1/2 Groove, Standard Size, Bi-metal, Aluminum Silicon, Chevy, 400, Set of 5

King SI-Series Main Bearings MB 509SI Bearings, SI-Series, 1/2 Groove, Standard Size, Bi-metal, Aluminum Silicon, Chevy, 400, Set of 5

SKU: KINGMB509SI

Main Bearings

King Engine Bearings

King SI-Series Main Bearings MB 509SI Bearings, SI-Series, 1/2 Groove, Standard Size, Bi-metal, Aluminum Silicon, Chevy, 400, Set of 5

SKU: KINGMB509SI

Main Bearings

IN STOCK! Est Ship 4-7 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.

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Description

IMPORTANT NOTICE: Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.Reference Information Reference Data (Provide these details to our support team) Brand Name/s King Engine Bearings, KING BEARINGS, King Racing StreetFX SKU kingMB509SI SFX Item ID 4859532 Accounting SKU king-MB509SI Manufacturer SKU MB509SI Manufacturer UPC 611500429330 Alternative References KEBMB509SI, KGB-MB509SI, MB 509SI

Main Bearing - Alecular SI - Standard - Small Block Chevy - Kit

Data: v2 - Desc: v4.2 - Upd: 2026-10-16 03:08:23

Part Type

Main Bearing Set

Data: v4.2 - Upd: 2026-10-15 22:06:24

Specifications

Main Bearings, SI-Series, 1/2 Groove, Standard Size, Bi-metal, Aluminum Silicon, Chevy, 400, Set of 5

King SI-Series main 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 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.

Product Attributes
Brand	King Engine Bearings
Manufacturer's Part Number	MB 509SI
Part Type	Main Bearings
Product Line	King SI-Series Main Bearings
UPC	611500429330
Bearing Usage	Direct replacement
Engine Crankshaft Undersize (in.)	Stock
Engine Crankshaft Undersize (mm)	Stock
Grooved Bearing	Yes
Groove Location	Upper
Groove Style	1/2
Thrust Bearing Oversize	Stock
Bearing Material	Bi-metal, silicon aluminum
Quantity	Sold as a set of 5.

Reference Information

Brand Name/s	King Engine Bearings
StreetFX SKU	kingMB509SI
SFX Item ID	4859532
Supplier Item Code	4859532
Manufacturer SKU	MB509SI
Manufacturer UPC	611500429330
Alternative References	KEBMB509SI, KGB-MB509SI, 509SI

Compatibility

No specific fitment data available for this part. For clarification, please contact us.

Detailed Compatibility

Application Data
Make	AVANTI
Model	II
Submodel	BASE
Beginning Year	1973
Ending Year	1974
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	U
Region	USA

Make	AVANTI
Model	II
Submodel	BASE
Beginning Year	1973
Ending Year	1976
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Region	USA

Make	CHEVROLET
Beginning Year	1970
Ending Year	1980
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1970
Ending Year	1971
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Region	USA

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1972
Ending Year	1974
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	R
Region	USA

Make	CHEVROLET
Model	BEL AIR
Submodel	BASE
Beginning Year	1973
Ending Year	1975
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	U
Region	USA

Make	CHEVROLET
Model	BISCAYNE
Submodel	BASE
Beginning Year	1970
Ending Year	1971
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Region	USA

Make	CHEVROLET
Model	BISCAYNE
Submodel	BASE
Beginning Year	1972
Ending Year	1972
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	R
Region	USA

Make	CHEVROLET
Model	BROOKWOOD
Submodel	BASE
Beginning Year	1970
Ending Year	1971
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Region	USA

Make	CHEVROLET
Model	BROOKWOOD
Submodel	BASE
Beginning Year	1972
Ending Year	1972
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	R
Region	USA

Make	CHEVROLET
Model	C10
Submodel	BIG TEN
Beginning Year	1980
Ending Year	1980
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	X
Region	USA

Make	CHEVROLET
Model	C10
Submodel	CHEYENNE
Beginning Year	1976
Ending Year	1976
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	U
Region	USA

Make	CHEVROLET
Model	C10
Submodel	CHEYENNE
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	R
Region	USA

Make	CHEVROLET
Model	C10
Submodel	CHEYENNE
Beginning Year	1980
Ending Year	1980
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	X
Region	USA

Make	CHEVROLET
Model	C10
Submodel	CUSTOM DELUXE
Beginning Year	1976
Ending Year	1976
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	U
Region	USA

Make	CHEVROLET
Model	C10
Submodel	CUSTOM DELUXE
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	R
Region	USA

Make	CHEVROLET
Model	C10
Submodel	CUSTOM DELUXE
Beginning Year	1980
Ending Year	1980
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	X
Region	USA

Make	CHEVROLET
Model	C10
Submodel	SCOTTSDALE
Beginning Year	1976
Ending Year	1976
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	U
Region	USA

Make	CHEVROLET
Model	C10
Submodel	SCOTTSDALE
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	R
Region	USA

Make	CHEVROLET
Model	C10
Submodel	SCOTTSDALE
Beginning Year	1980
Ending Year	1980
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	X
Region	USA

Make	CHEVROLET
Model	C10
Submodel	SILVERADO
Beginning Year	1976
Ending Year	1976
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	U
Region	USA

Make	CHEVROLET
Model	C10
Submodel	SILVERADO
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	R
Region	USA

Make	CHEVROLET
Model	C10
Submodel	SILVERADO
Beginning Year	1980
Ending Year	1980
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	X
Region	USA

Make	CHEVROLET
Model	C20
Submodel	CHEYENNE
Beginning Year	1976
Ending Year	1976
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	U
Region	USA

Make	CHEVROLET
Model	C20
Submodel	CHEYENNE
Beginning Year	1977
Ending Year	1979
Engine Type	V8
Liter	6.6
CID	400
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Engine VIN Code	R
Region	USA

This may not be an exhaustive list of compatible vehicles. Please reach out to one of our representatives if you are unsure or do not see your vehicle here.

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King SI-Series Main Bearings MB 509SI Bearings, SI-Series, 1/2 Groove, Standard Size, Bi-metal, Aluminum Silicon, Chevy, 400, Set of 5

King SI-Series Main Bearings MB 509SI Bearings, SI-Series, 1/2 Groove, Standard Size, Bi-metal, Aluminum Silicon, Chevy, 400, Set of 5

Description

Part Type

Specifications

Reference Information

Compatibility

Detailed Compatibility

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