What does the 0.010 inch undersize mean for my engine?

The 0.010 inch undersize indicates that these bearings are intended for a crankshaft that has been machined down by 0.010 inches. This is typically done to clean up wear or imperfections on the original crankshaft surface, providing a fresh mating surface for the new bearings.

What is the material construction of these bearings?

These Clevite main bearings are made with a tri-metal construction. This advanced material composition is known for its excellent load-carrying capacity and durability, helping to withstand the demanding conditions within an engine's crankcase.

Do these bearings come with installation hardware?

This listing is for the main bearing set only. Installation hardware, such as main bearing bolts or seals, is typically sold separately. It is recommended to consult your vehicle's service manual for a complete list of parts needed for your engine rebuild.

Clevite Main Bearing Set 1000-MS1038H10 - 1970-80 GMC 400 6.

Name: Clevite GMC Pass & Trk 400 6.6L 1970-80 Main Bearing Set
Brand: Clevite
SKU: clevite-clevite-gmc-pass-trk-400-6-6l-1970-80-main-bearing-set-t14-57270
Price: 127.86 USD
Availability: BackOrder

Clevite GMC Pass & Trk 400 6.6L 1970-80 Main Bearing Set

$127.86

On Backorder

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

Clevite 0.010 inch undersize main bearing set for 1970-80 GMC 400 6.6L engines.

Key Features

Fits 1970-1980 GMC 400 6.6L engines.
Features a 0.010 inch undersize for use with machined crankshafts.
Constructed with Clevite's durable tri-metal material for strength and wear resistance.
Designed to reduce friction and heat in the engine's bottom end.
Helps ensure proper crankshaft alignment and oil clearance.

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Will this fit your vehicle?

Product Details

When you're rebuilding the bottom end of your 400 cubic inch, 6.6-liter GMC engine from 1970 to 1980, getting the main bearings right is crucial for long-term reliability. This Clevite MS1038H10 main bearing set is built with a 0.010 inch undersize, meaning it's designed to fit crankshafts that have been machined down by that amount to clean up wear or damage. This is a common step when reconditioning an engine block to ensure a fresh, true surface for the bearings to ride on.

Clevite uses a specialized tri-metal construction for these bearings, which is known for its strength and ability to handle the heavy loads and heat generated within the crankcase. This material composition helps to reduce friction and wear, contributing to a smoother running engine and extending the life of your crankshaft and bearings. The 0.010 inch undersize is a standard machining size, so if your crankshaft has been prepped for it, these bearings will fit right in.

This set is designed to fit a wide range of Chevrolet, GMC, and Pontiac vehicles from the early to late 70s that used the 400ci engine, including popular models like the Chevrolet C10, GMC C1500, and Pontiac Grand Prix. Make sure to verify your specific vehicle's fitment and confirm that your crankshaft has been machined to the 0.010 inch undersize before ordering.