What does '0.25 Oversized' mean for these bearings?

This means the bearings are 0.25mm smaller in diameter than the standard size. They are intended for use when your engine's crankshaft has been machined down by 0.25mm to ensure proper fit and oil clearance.

Are these bearings suitable for a stock engine rebuild?

Yes, these are high-performance bearings, but they can be used in a stock rebuild if your crankshaft has been machined to the 0.25mm undersize specification. They offer well-built construction for reliable operation.

What other parts are typically needed when installing main bearings?

When replacing main bearings, it's common practice to also replace the connecting rod bearings, oil pump, and oil seals. Ensure your crankshaft journals are clean and within tolerance before installation.

ACL 68-74 Nissan L16E/L18E 1595cc/1770cc 4cyl 0.25 Oversized High Performance Main Bearing Set

Specifications

Brand: ACL
Part #: 5M1172H-.25
UPC: 9315726453667

ACL 68-74 Nissan L16E/L18E 1595cc/1770cc 4cyl 0.25 Oversized High Performance Main Bearing Set

Name: ACL 68-74 Nissan L16E/L18E 1595cc/1770cc 4cyl 0.25 Oversized High Performance Main Bearing Set
Brand: ACL
Price: 186.78 USD
Availability: InStock

$186.78

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Fits 1968-1979 Nissan 510. ACL 0.25mm undersize main bearing set for L16E/L18E engines. High performance build.

Key Features

Fits 1968-1979 Nissan 510, 1969-1972 Nissan 521 Pickup, 1973 Nissan 610, 1972-1974 Nissan 620 Pickup, and 1974 Nissan 710.
Designed for Nissan L16E and L18E engines (1595cc and 1770cc 4-cylinder).
Main bearing set is 0.25mm undersize for use with a machined crankshaft.
High-performance bearing set from ACL, a well-known manufacturer.
Helps maintain proper oil clearance for the crankshaft.

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Will this fit your vehicle?

Product Details

ACL has been making engine bearings for decades, and this high-performance main bearing set for your Nissan L16E or L18E engine is one of their staples. If you're rebuilding your 1595cc or 1770cc four-cylinder, these bearings are a solid choice for ensuring proper oil clearance and supporting your crankshaft.

This set is manufactured to tight tolerances, meaning they'll help maintain the correct oil film between your crankshaft and the engine block. They are 0.25mm undersize, which is important to note if you're machining your crankshaft. Using bearings that are the correct size for your machined crank is crucial for oil pressure and engine longevity. ACL is known for well-built components, and these bearings are designed to handle the demands of a performance-oriented rebuild.

When you're putting an engine back together, especially one that's been rebuilt or modified, getting the main bearings right is key. This set is verified to fit a range of Nissan models including the 510, 521 Pickup, 610, 620 Pickup, and 710, covering various years from 1968 through 1979. Make sure to check your crankshaft's dimensions to confirm it's been machined to accept a 0.25mm undersize bearing.