What does the '030' size mean for these bearings?

The '030' indicates that these bearings are 0.030 inches undersize. This means they are designed to be used with a crankshaft that has been ground down by 0.030 inches during a rebuild or reconditioning process. It's crucial to match the bearing size to your crankshaft's specifications.

What is the construction of these main bearings?

These main bearings are constructed with a bimetal design, which utilizes an aluminum base. This type of construction is chosen for its ability to perform well across various operating conditions and temperatures.

Do these bearings come with new bolts or hardware?

This listing is for the crankshaft main bearing set only. New main bearing cap bolts are typically recommended for engine rebuilds, but they are not included with this bearing set. You will need to source those separately.

Specifications

Brand: King Engine Bearings
Part #: MB5518AM060
UPC: 611500197468

King Engine Bearings AMC / Jeep 390 & 401 (Size 030) Crankshaft Main Bearing Set

Name: King Engine Bearings AMC / Jeep 390 & 401 (Size 030) Crankshaft Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-amc-jeep-390-401-size-030-crankshaft-m-t14-208066
Price: 65.77 USD
Availability: BackOrder

$65.77

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King Engine Bearings crankshaft main bearing set for AMC/Jeep 390 & 401 engines. Size 030.

Key Features

Fits a wide range of AMC and Jeep vehicles with 390 and 401 engines.
This is a crankshaft main bearing set.
Features a bimetal construction with an aluminum base.
The set is 0.030 inches undersize, intended for use with a machined crankshaft.
Part number MB5518AM060.

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About this part

Product Details

If you're rebuilding the bottom end of your AMC or Jeep 390 or 401 engine, this King Engine Bearings crankshaft main bearing set is a solid option. These bearings are built with a bimetal construction, using an aluminum base for good performance in a wide range of applications. This particular set is sized 0.030 inches undersize, which is important to match with your crankshaft grinding if you're reconditioning it.

King Engine Bearings is a well-known name in the engine parts world, and this set is made to fit a variety of AMC and Jeep vehicles from the late 60s through the early 90s. Whether you're working on a classic Javelin, a Jeep CJ, or a Wagoneer, these bearings are designed to go in and do their job reliably. They are a direct replacement for your original main bearings, assuming your crankshaft has been machined to the correct undersize.