What does '.01 Oversize' mean for these main bearings?

This means the bearings are designed to fit a crankshaft that has been machined down by 0.010 inches. This is common when rebuilding an engine to correct for wear or to achieve specific clearances.

Are these bearings suitable for a stock engine rebuild?

While these are Race Series bearings built for performance, they can be used in a stock rebuild if the crankshaft has been machined to the correct oversize. For a completely stock, unmachined crankshaft, you would need a standard size bearing.

What other parts are typically replaced with main bearings during an engine rebuild?

During a main bearing replacement, it's common practice to also replace the connecting rod bearings, piston rings, oil pump, and timing set to ensure a complete and reliable engine overhaul.

ACL Main Bearing Set .01 Oversize 5M909H-01

Name: ACL Chevrolet V8 267/305/327/350 Race Series .01 Oversize Main Bearing Set
Brand: ACL
SKU: acl-acl-chevrolet-v8-267-305-327-350-race-series-01-oversize-main-bearing-set-t14-547738
Price: 96.23 USD
Availability: BackOrder

ACL Chevrolet V8 267/305/327/350 Race Series .01 Oversize Main Bearing Set

$96.23

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

ACL Chevrolet V8 Race Series main bearing set. .01 inch oversize. Direct fit for many V8 engines.

Key Features

Fits many Chevrolet and GMC V8 engines from 1968-1973.
Main bearing set is .010 inches oversize for use with a machined crankshaft.
ACL Race Series bearings are constructed from a durable tri-metal material.
Designed for performance applications and higher load capacities.

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Will this fit your vehicle?

Product Details

Already rebuilding your Chevrolet V8 engine? This ACL Race Series main bearing set is a solid choice for your build, especially if you're looking to get the most out of your 267, 305, 327, or 350 cubic inch engine. Main bearings are critical for keeping your crankshaft spinning smoothly within the engine block, and a fresh set is essential for any engine overhaul or performance build.

This set is specifically .010 inches oversize, meaning it's designed to be used with a crankshaft that has been machined down by that amount. ACL uses a well-built tri-metal material that offers good strength and durability for demanding applications. The Race Series designation means these bearings are built to handle higher loads and RPMs than standard bearings, making them a popular choice for performance builds and racing engines.

This set fits a wide range of Chevrolet and GMC V8 applications from the late 60s through the early 70s. Make sure to check the full fitment list to confirm compatibility with your specific vehicle. When installing, always refer to your vehicle's service manual for proper torque specifications and assembly procedures.