What does the '+0.020' size mean for these main bearings?

The '+0.020' indicates that these bearings are 0.020 inches larger in diameter than standard size. They are designed to be used with a crankshaft that has been machined down by 0.020 inches to correct wear or imperfections.

What is the overlay material on these bearings?

King Engine Bearings uses a specialized overlay material designed to withstand the high pressures and temperatures found in performance and rebuilt engines. This material helps ensure consistent lubrication and wear resistance.

Are these bearings suitable for a stock engine rebuild?

These bearings are sized at +0.020, which means they are intended for a crankshaft that has been machined undersize. If your crankshaft is still at standard size, you would need a standard size bearing set.

Specifications

Brand: King Engine Bearings
Part #: MB5212SI020
UPC: 611500550454

King Engine Bearings Chevrolet 396/400/427/502 16V (Size +0.20) Main Bearing Set

Name: King Engine Bearings Chevrolet 396/400/427/502 16V (Size +0.20) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-chevrolet-396-400-427-502-16v-size-0-2-t14-4402743
Price: 141.98 USD
Availability: BackOrder

$141.98

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King Engine Bearings main bearing set for Chevrolet 396, 400, 427, 502 engines. Size +0.020.

Key Features

Main bearing set for Chevrolet 396, 400, 427, and 502 engines.
Bearing size is +0.020 inches, intended for use with a machined crankshaft.
Features a specialized overlay material for durability under load.
Helps maintain proper oil clearance and lubrication for engine longevity.

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About this part

Product Details

If you're rebuilding the bottom end of your Chevrolet 396, 400, 427, or 502 big block, getting the main bearings right is crucial for engine longevity. This set from King Engine Bearings is specifically sized at +0.020 inches, meaning it's designed to fit crankshafts that have been machined down by that amount to correct wear or runout.

King uses a specialized overlay material that's well-built to handle the pressures and heat generated in these powerful engines. The +0.020 sizing is important because it ensures a proper oil clearance when paired with a correspondingly machined crankshaft. This helps maintain consistent oil pressure and lubrication to the rotating assembly, which is key for preventing premature wear.

When you're putting a performance or rebuilt engine back together, using bearings that fit right and are made to last makes a big difference. This set is a solid option for anyone looking to ensure their big block Chevy runs smoothly and reliably.