OE replacment Bi-metal + Polymer For GM LS 4.3 V6 - MB4555MC

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King Bearings' MC Series incorporates a bi-metal structure with a steel back and strengthened Aluminum alloy, topped by a nano-composite polymer coating, referred to as K-340, having excellent anti friction & wear resistance properties. MC Lead-free bearings are well-suited for start-stop and hybrid engines that endure continuous metal-to-metal contact.
Commonly use for start-stop and hybrid engines that endure continuous metal-to-metal contact
Crankshaft Dim. Housing Dim. Length Thickness
65.01 / 64.99 mm
2.5593 / 2.5588 inch
69.89 / 69.87 mm
2.7514 / 2.7509 inch
Positions 1,2,4:
20.4 mm
0.805 inch

Position 3:
26.2 mm
1.031 inch
2.431 mm
0.0957 inch
Main Bearing Set For GM LS 4.3 V6 - MB4555MC
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Performance features

Material features

Tech Features

Aluminum Based
aluminum base
Bi Metal Aluminum material

Lead free Aluminum based material used for low to heavy load engines

Polymer Coated
Polymer Coated
Polymer coating

Factory Applied Nano-composite Polymer Coating – With No Added Thickness.

Lead free
Lead Free
Environmentally safe composite

A lead-free bearing material prioritizes environmental sustainability and safety, utilizing alternative compounds to achieve optimal performance in diverse applications.

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