What does the '+0.25mm' size mean for these bearings?

The '+0.25mm' indicates that these bearings are 0.25 millimeters larger in diameter than a standard-sized bearing. This sizing is typically used when the crankshaft journals have been machined down (ground undersize) to remove wear or damage.

What is 'tri-metal' construction?

Tri-metal bearings have three distinct layers of materials. This construction is known for its ability to handle high loads and temperatures while maintaining good oil film support, making them a popular choice for performance engines.

Do these bearings come with new main bolts?

This set includes the main bearings only. New main bearing bolts are typically recommended for engine rebuilds, but they are sold separately.

Specifications

Brand: King Engine Bearings
Part #: MB4508XP0.25
UPC: 611500614811

King Engine Bearings Honda J30 / J35 (Size +0.25mm) Tri Metal Main Bearing Set

Name: King Engine Bearings Honda J30 / J35 (Size +0.25mm) Tri Metal Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-honda-j30-j35-size-0-25mm-tri-metal-ma-t14-354084
Price: 122.93 USD
Availability: BackOrder

$122.93

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King Engine Bearings Honda J30 / J35 (Size +0.25mm) Tri Metal Main Bearing Set. For engine rebuilds needing main bearing replacement.

Key Features

Main bearing set for Honda J30 and J35 engines.
Bearings are 0.25mm undersize for use on machined crankshaft journals.
Tri-metal construction offers good heat and oil control.
Designed to replace worn or damaged main bearings during an engine rebuild.

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About this part

Product Details

If you're rebuilding the bottom end of your Honda J30 or J35 engine, getting the main bearings right is crucial for long-term health. This set from King Engine Bearings is designed to replace your stock main bearings, but with a specific size adjustment. These bearings are 0.25mm (or about 0.010 inches) larger in diameter than standard, which is useful if your crankshaft journals have been ground down during a previous rebuild or to correct for wear.

King uses a tri-metal construction for these bearings, which is a popular choice for performance and high-stress applications. This layering of materials helps manage heat and oil flow effectively, providing a solid foundation for your engine's rotating assembly. The 0.25mm sizing means they're intended for use on crankshafts that have been machined to this specific undersize. Make sure to confirm your crankshaft journal size before ordering to ensure a proper fit.