What does 'STD' mean for these bearings?

STD stands for standard size. This means the bearings are designed to fit a crankshaft and engine block that are still within the manufacturer's original factory specifications. If your crankshaft has been machined undersize, you would need a different bearing size.

Are these bearings suitable for a daily driver?

While these are Race Series bearings, they are a well-built option for any engine rebuild. They offer improved durability and performance compared to standard bearings, making them a solid choice even for a daily driver looking for extra peace of mind.

What else might I need when installing these bearings?

When installing main bearings, it's crucial to use assembly lube on the bearing surfaces to prevent damage during initial startup. You'll also need to ensure your crankshaft and block surfaces are perfectly clean and within factory tolerances.

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Est. 1957

Specifications

Brand: ACL
Part #: 5M1117H-STD

ACL Ford 4 2300 (Single Spark Plug engines) Race Series Engine Crankshaft Main Bearing Set

Name: ACL Ford 4 2300 (Single Spark Plug engines) Race Series Engine Crankshaft Main Bearing Set
Brand: ACL
SKU: acl-acl-ford-4-2300-single-spark-plug-engines-race-series-engine-crankshaft-main-t14-630609
Price: 125.52 USD
Availability: BackOrder

$125.52

On Backorder

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

Fits 1979 Ford Mustang. ACL Race Series crankshaft main bearing set for single spark plug engines.

Key Features

Fits 1979 Ford Mustang.
ACL Race Series crankshaft main bearing set.
Standard size (STD) for engines within factory tolerances.
Designed for performance applications.

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About this part

Product Details

You get a full set of crankshaft main bearings in this kit, which means one box handles the whole job for your engine's bottom end. These ACL Race Series bearings are built for performance applications, helping to keep your engine running smoothly under demanding conditions. They're a solid choice if you're rebuilding your engine or looking for improved reliability.

ACL has been making engine bearings for a long time, and their Race Series is a popular option for folks who push their engines a bit harder. These are standard size (STD), meaning they're meant to be installed in a crankshaft and block that are still within factory tolerances. If your engine has seen a lot of miles, you might need to have the crankshaft ground undersize and order a corresponding bearing set, but for a fresh rebuild on a clean block and crank, these are what you'll want.