What does '0.030 inch undersize' mean for these bearings?

This means the bearings are manufactured to be 0.030 inches smaller in diameter than a standard, full-size bearing. They are intended for use when the crankshaft journals have been machined down by 0.030 inches to correct wear or damage during an engine rebuild.

Are these bearings suitable for a stock, unmachined crankshaft?

No, these bearings are specifically 0.030 inch undersize. They are designed for crankshafts that have been professionally machined down by that specific amount. Using them on a stock crankshaft will result in excessive oil clearance and potential engine damage.

What other parts are typically needed when installing main bearings?

When replacing main bearings as part of an engine rebuild, you'll also need to consider main bearing cap bolts, engine oil, and potentially a new crankshaft if it's beyond repair. Always refer to your vehicle's service manual for a complete list of required parts and procedures.

Clevite Subaru EJ Series Main Bearing Set MS2250A30

Name: Clevite Subaru EJ Series 1990-2005 Main Bearing Set
Brand: Clevite
Price: 183.50 USD
Availability: InStock

Clevite Subaru EJ Series 1990-2005 Main Bearing Set

$183.50

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Clevite Subaru EJ Series 1990-2005 Main Bearing Set. This set is 0.030 inch undersize for engine rebuilding.

Key Features

Fits 1990-2005 Subaru EJ Series engines.
Also fits 2004-2012 Chevrolet Colorado and GMC Canyon.
Also fits 2006-2010 Hummer H3 and H3T.
This set is 0.030 inch undersize for use with machined crankshafts.
Helps restore proper oil clearance for a rebuilt engine.

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Will this fit your vehicle?

Product Details

This Clevite main bearing set is 0.030 inch undersize, meaning it’s intended for crankshafts that have been machined down by that amount during an engine rebuild. These bearings are built for the Subaru EJ series engines found in many vehicles from 1990 to 2005, and also fit a range of other applications like the Chevrolet Colorado and GMC Canyon from 2004-2012, and Hummer H3 models from 2006-2010.

When you're rebuilding an engine, the crankshaft journals are often ground down to a standard undersize to clean up any wear or damage. This set is designed to match those machined journals, helping to restore proper oil clearance and ensure the crankshaft spins smoothly within the engine block. Clevite has been a well-known name in engine bearings for a long time, and these are a solid option for getting your engine back in shape.

If you're in the middle of an engine overhaul and have had your crankshaft journals turned to the 0.030 inch undersize, this set will fit right in. Make sure to check your specific engine's requirements and the machining specifications for your crankshaft before ordering.