Availability
1991 Main Bearings
Main Bearings, 1/2 Groove, .010 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Chevy, Small Block, Set of 5
Part Number: KGB-MB5570SI010
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, Standard Size, Bi Metal, 3/4 Groove, Chevy, V6, 3.3L, 3.8L, 4.3L, Set of 4
Part Number: SLP-5085MA
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, Competition, 0.020 in. Crankshaft Undersize, Tri Metal, 3/4 Groove, Chevy, 302, 305, 350, Set of 5
Part Number: SLP-139M20
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, Competition, 0.001 in. Crankshaft Undersize, Tri Metal, 3/4 Groove, Chevy, 302, 305, 350, Set of 5
Part Number: SLP-139M1
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, Aluglide, A-Series, Grooved, Bi-Metal, Aluminum/Tin/Silicon, Stock Size Crank, Chevy, Excalibur, 6.5L, 6.6L, 7.0L, 7.4L, Set of 5
Part Number: PEB-5M829A-STD
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, Competition, 0.010 in. Crankshaft Undersize, Tri Metal, 3/4 Groove, Ford, 351M, 351W, 400, Set of 5
Part Number: SLP-130M10
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, 0.010 in. Crankshaft Undersize, Bi Metal, 1/2 Groove, Ford, 351W, 351M, 400, Set of 5
Part Number: SLP-5078MA10
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, 0.020 in. Crankshaft Undersize, Tri Metal, 1/2 Groove, AMC, 290, 304, 343, 360, Set of 5
Part Number: SLP-5037M20
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, XP-Series, Copper/Lead/Nickel, Standard Size, Ford, Lincoln, Mercury, Set of 5
Part Number: KGB-MB529XPSTDX
Not Yet Reviewed
Estimated Ship Date: Jun 29, 2026 if ordered today
Estimated Ship Date: Jun 29, 2026 if ordered today
Need It Sooner? We recommend these similar substitute parts:
Main Bearings, Standard Size, Bronze Alloy, AM General, Chevy, GMC, Hummer, 6.2, 6.5, Set of 5
Part Number: SLP-7370M
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, AM-Series, Full Groove, Alecular Silicon, 0.25mm. Crankshaft Undersize, Ford, 2.0L, 2.3L, Set of 5
Part Number: KGB-MB582AM025
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, 1/2 Groove, Standard Size, Bi-metal, Silicon Aluminum, Ford Modular V8, Set of 5
Part Number: KGB-MB5280SI
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, SI-Series, Full Groove, .010 in. Crankshaft Undersize, Bi-metal, Silicon Aluminum, Jeep, Mopar, Set of 5
Part Number: KGB-MB5534SI010
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, 0.030 in. Crankshaft Undersize, Tri Metal, 1/2 Groove, AMC, 290, 304, 343, 360, Set of 5
Part Number: SLP-5037M30
Not Yet Reviewed
Estimated Ship Date: Apr 20, 2026 if ordered today
Estimated Ship Date: Apr 20, 2026 if ordered today
Main Bearings, Competition, 0.011 in. Crankshaft Undersize, Tri Metal, 3/4 Groove, Chevy, 302, 305, 350, Set of 5
Part Number: SLP-139M11
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, AM-Series, 3/4 Groove, Standard Size, Bi Metal, Ford, 2.3, 2.5L, Set of 5
Part Number: KGB-MB5278AM
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, AM-Series, Full Groove, Standard Size, Bi Metal, Oldsmobile, 260, 307, 330, 350, 403, Set of 5
Part Number: KGB-MB5514AM
Estimated Ship Date: Jun 29, 2026 if ordered today
Estimated Ship Date: Jun 29, 2026 if ordered today
Summit Precision High-Tensile Tri-Metal Alloy COATED Racing Main Bearings, BBF 460 .001 Extra Clearance, 3/4 Upper and Lower groove, set
Part Number: SUM-1039HXCS
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, P Series, 1/2 Groove, Standard Size, Tri Metal, Chevy, 3.3, 3.8, 4.3L, V6, Set of 5
Part Number: CLE-MS1454P
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, XP-Series, Copper/Lead/Nickel, Standard Size, for use on Acura®, Honda®, Set of 5
Part Number: KGB-MB5568XP
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, AM-Series, 1/2 Groove, Standard Size, Bi Metal, Buick, Land Rover, MG, Rover, V8, Set of 5
Part Number: KGB-MB589AM
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, H Series, 0.001 in. Extra Clearance, Standard Size, Alecular, Chevy, Big Block, Set of 5
Part Number: EW1-MS829HX
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Summit Precision High-Tensile Tri-Metal Alloy Racing Main Bearings, BBF 460 Standard Clearance, 3/4 Upper and Lower groove, set
Part Number: SUM-1039HS
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, Aluglide, A-Series, Grooved, Bi-Metal, 0.01 in./0.25mm Undersize Crankshaft, Chevy, Excalibur, 6.5L, 6.6L, 7.0L, 7.4L, Set of 5
Part Number: PEB-5M829A-10
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Main Bearings, SI-Series, Silicon Aluminum, 0.020 in. Crankshaft Undersize, Chevy, GMC, Big Block, Set of 5
Part Number: KGB-MB5212SI020
Not Yet Reviewed
Estimated Ship Date: Jun 29, 2026 if ordered today
Estimated Ship Date: Jun 29, 2026 if ordered today
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