What is the main advantage of these Race Series bearings over standard bearings?

These ACL Race Series bearings are built with a heavier duty construction and a specialized overlay system. This design helps them handle higher loads and temperatures that are common in performance or racing applications, offering improved durability.

Are these bearings a direct replacement for all Chevrolet V8 engines?

This specific set is designed for Chevrolet 305, 350, and 400 cubic inch V8 engines. While they fit many vehicles with these engines, it's important to verify fitment for your exact year, make, and model.

What does 'STD' size mean for these bearings?

STD stands for standard size. This means the bearings are intended for use with a crankshaft that is within factory specifications or has been machined back to the original factory size.

ACL Chevrolet V8 305-350-400 Race Series Con Rod Bearing Set

Specifications

Brand: ACL
Part #: 8B663HD-STD
UPC: 9315726273210

ACL Chevrolet V8 305-350-400 Race Series Con Rod Bearing Set

Name: ACL Chevrolet V8 305-350-400 Race Series Con Rod Bearing Set
Brand: ACL
SKU: acl-acl-chevrolet-v8-305-350-400-race-series-con-rod-bearing-set-t14-4332890
Price: 152.70 USD
Availability: BackOrder

$152.70

On Backorder — Expected to ship by Jul 9, 2026

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

ACL Chevrolet V8 305-350-400 Race Series Con Rod Bearing Set. Heavy-duty bearings for performance builds.

Key Features

Fits 112+ vehicle make/model combinations.
ACL Race Series heavy-duty connecting rod bearings.
Designed for Chevrolet 305, 350, and 400 cubic inch V8 engines.
Standard size for use with factory or reconditioned crankshafts.
Specialized overlay system for improved load and temperature handling.

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Will this fit your vehicle?

Product Details

If you're rebuilding the top end of a Chevrolet V8 engine, specifically the 305, 350, or 400 cubic inch small blocks, you're likely looking for robust internal components. These ACL Race Series connecting rod bearings are built for those kinds of applications. They offer a heavier duty construction compared to standard bearings, which is important when you're pushing an engine harder, whether that's for racing or just spirited street driving.

ACL has been making engine bearings for a long time, and this Race Series set uses a specialized overlay system. This system is designed to handle higher loads and temperatures that can occur in performance engines. The standard size means they're meant to be used with a crankshaft that's still within factory specifications, or has been recently machined back to standard size. They fit right into the connecting rods and crankshaft journals, making them a solid choice for a performance rebuild where reliability is key.

When you're putting an engine back together, especially one that's going to see more than just daily commuting, using well-built bearings like these from ACL is a smart move. Make sure your crankshaft journals are clean and within the correct size specifications before installation, and always follow the manufacturer's lubrication and torque guidelines.