What does the '+1.0' size designation mean for these bearings?

The '+1.0' indicates that these main bearings are 0.001 inches larger in diameter than standard size. This means they are intended for use with a crankshaft that has been machined down by 0.001 inches to true it up or remove imperfections.

What is the advantage of a bimetal aluminum silicon base bearing?

A bimetal bearing with an aluminum silicon base offers a good combination of strength and conformability. This construction helps the bearing handle engine loads effectively while also allowing it to adapt to the crankshaft surface for optimal oil film support and wear resistance.

Are any other parts needed when installing these main bearings?

When installing main bearings, it is essential to have the crankshaft professionally machined to the correct undersize if necessary, and to use new main cap bolts or studs. Always refer to the manufacturer's installation instructions for a complete list of recommended procedures and parts.

King Engine Bearings Ford 281CI/330CI 4.6L/5.4L V8 (Size +1.0) Main Bearing Set

Specifications

Brand: King Engine Bearings
Part #: MB5280SI1.0
UPC: 611500423093

King Engine Bearings Ford 281CI/330CI 4.6L/5.4L V8 (Size +1.0) Main Bearing Set

Name: King Engine Bearings Ford 281CI/330CI 4.6L/5.4L V8 (Size +1.0) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-ford-281ci-330ci-4-6l-5-4l-v8-size-1-0-t14-4336762
Price: 46.72 USD
Availability: BackOrder

$46.72

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King Engine Bearings main bearing set for Ford 4.6L/5.4L V8 engines. Size +1.0. Built with a bimetal aluminum silicon base.

Key Features

Fits a wide range of Ford 281 and 330 cubic inch 4.6L and 5.4L V8 engines.
Main bearing set is +1.0 undersize, suitable for reconditioned crankshafts.
Constructed with a bimetal design featuring an aluminum silicon base.
Designed for durability and proper load handling in V8 applications.

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Will this fit your vehicle?

Product Details

When you're rebuilding the bottom end of your Ford 281 or 330 cubic inch V8, like those found in many Crown Victorias, Mustangs, and F-150s, a solid set of main bearings is crucial. This set from King Engine Bearings is specifically designed for those 4.6L and 5.4L engines and comes at a +1.0 undersize, meaning it's intended for crankshafts that have been machined down by 0.001 inches. These bearings are constructed with a bimetal design, featuring an aluminum silicon base, which helps them handle the loads and heat generated by the engine.

King Engine Bearings is a well-known name in the performance and racing world, and this set reflects their focus on durable engine components. The bimetal construction offers a good balance of strength and conformability, allowing the bearing to properly seat against the crankshaft and main caps while resisting wear. Using a +1.0 undersize bearing set is common practice when a crankshaft needs to be reconditioned to true it up and remove any imperfections from its surface.