What does the STDX designation mean for these bearings?

The STDX designation indicates that these main bearings are .005 inch undersize. This means they are intended for use with a crankshaft that has been machined down by five-thousandths of an inch.

What is the benefit of the polymer coating on these bearings?

The high-performance polymer coating on these bearings helps to reduce friction and wear. This is particularly beneficial during the engine's break-in period and under more demanding operating conditions.

Are these bearings suitable for a stock, unmachined crankshaft?

No, these bearings are specifically .005 inch undersize (STDX). They are designed for use with a crankshaft that has been machined to that specific undersize. Using them on a stock crankshaft will result in incorrect oil clearance and potential engine damage.

Specifications

Brand: King Engine Bearings
Part #: MB5799XPGSTDX
UPC: 611500598135

King Engine Bearings Subaru Fa20/ Toyota 4U-GSE/ O/S Housing .005 (Size STDX) Main Bearing Set

Name: King Engine Bearings Subaru Fa20/ Toyota 4U-GSE/ O/S Housing .005 (Size STDX) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-subaru-fa20-toyota-4u-gse-o-s-housing--t14-432521
Price: 137.95 USD
Availability: BackOrder

$137.95

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King Engine Bearings Subaru FA20/Toyota 4U-GSE main bearing set. Size STDX (.005 inch undersize).

Key Features

This is a King Engine Bearings main bearing set for Subaru FA20 and Toyota 4U-GSE engines.
The set is .005 inch undersize (STDX) for use with a machined crankshaft.
Features King's unique overlay material with a high-performance polymer coating.
Designed to reduce friction and wear, especially during break-in.

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About this part

Product Details

If you're rebuilding the bottom end of your Subaru FA20 or Toyota 4U-GSE engine, getting the main bearings right is crucial for long-term health. These King Engine Bearings are specifically made for those engines, and this set is .005 inch undersize, indicated by the STDX designation, which is important if your crankshaft has been machined to that size.

King uses a unique overlay material with a high-performance polymer coating. This combination helps reduce friction and wear, especially during the critical break-in period and under demanding conditions. The STDX size means they are designed to fit a crankshaft that has been ground down by five-thousandths of an inch, ensuring a proper fit and oil clearance if that machining has been done. Getting the right bearing size is key to maintaining correct oil pressure and preventing premature wear.