What does the 0.010 undersize mean for these bearings?

The 0.010 undersize indicates that these bearings are slightly smaller than standard size. This is necessary when the crankshaft journals have been machined down (ground undersize) during an engine rebuild to remove wear or damage. Using the correct undersize bearing ensures a proper fit and oil clearance.

What is the advantage of tri-metal construction?

Tri-metal bearings, like these from ACL, use three layers of material. This construction offers a good combination of strength to handle loads, conformability to adapt to the crankshaft surface, and embeddability to absorb small debris without causing damage.

Do these bearings come with installation instructions?

While this set includes the main bearings, it's recommended to refer to the specific service manual for your vehicle's engine for detailed installation procedures. Proper installation, including checking oil clearances and crankshaft straightness, is crucial for engine longevity.

ACL Crankshaft Main Bearing Set 5M2152H-010

Name: ACL Ford 4 1500-1600cc OHV/Twin Cam Engine Crankshaft Main Bearing Set
Brand: ACL
Price: 89.18 USD
Availability: InStock

ACL Ford 4 1500-1600cc OHV/Twin Cam Engine Crankshaft Main Bearing Set

$89.18

On Backorder — Expected to ship by Apr 8, 2026

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

ACL Ford 4 1500-1600cc OHV/Twin Cam Engine Crankshaft Main Bearing Set

Key Features

Fits Ford Cortina, Ford Pinto, Lotus Seven, Mercury Capri, Morgan 4/4, and TVR Vixen.
Designed for Ford 1500-1600cc OHV and Twin Cam engines.
Main bearing set is 0.010 inches undersize for use with machined crankshafts.
Features a high-performance overlay for durability and reduced friction.
Tri-metal construction balances strength and conformability.
Supports crankshaft rotation and maintains oil pressure.

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Will this fit your vehicle?

Product Details

200,000 psi tensile strength puts these ACL main bearings well above stock hardware. When you're rebuilding or refreshing the bottom end of your Ford 1500-1600cc OHV or Twin Cam engine, the crankshaft main bearings are critical. They support the crankshaft, allowing it to spin smoothly while handling immense forces. These ACL bearings are built with a high-performance overlay that's designed to handle the demands of both street and track use.

This set is specifically sized at 0.010 inches undersize, which is important if your crankshaft journals have been machined down during a rebuild. The tri-metal construction offers a good balance of strength and conformability, helping to maintain oil pressure and reduce friction. ACL has been making engine bearings for a long time, and this set is a solid option for anyone looking to ensure their engine's longevity and performance.

This set fits a variety of vehicles including the Ford Cortina, Ford Pinto, Lotus Seven, Mercury Capri, Morgan 4/4, and TVR Vixen from various years. Always double-check your specific application to ensure this is the correct bearing size for your build.