King XPG Series OD+.002" Oversize Outside Diameter Main Bearing | Subaru WRX/STI (MB5739XPG)
King Engine Bearings*SEE DETAILS
Due to the nature of the Subaru split-block boxer engine design, where two halves of the engine are fastened together around the crankshaft, there can often be distortion or misalignment even on new engine blocks. This distortion can lead to uneven main bearing wear and occasionally bearing failure due to insufficient lubrication and overloading of the bearing surface material. Main line bore distortion can also occur in new blocks that have been assembled using high strength case fasteners, which are common in racing and high performance engine builds.
When an EJ engine requires a repair to remedy a main line bore distortion issue, the labor involved can be tedious and therefore very expensive. The machinist would have to remove material from both sides of the split-block's mating surfaces and bore or hone back to a STD housing bore measurement so that a standard OD bearing can be utilized. This process also requires and extreme amount of precision and can cause a change in the crankshaft centerline to deck surface distance that would need to be compensated for.
Housing Bore Spec's
- 2.5217"-2.5225"
- 64.051mm-64.071mm
Crankshaft Undersizes
- STD
- STDX
- .026
- .25
- .50
Applications
- 2004-2012 Subaru WRX
- 2004-2012 Subaru STI
What's in the box?
- 1 Set of Main Bearings
Warranty
- King Limited Warranty
- For More Info Contact Us
Customer Reviews
Finally got my car almost done the tuner said I chose very high quality parts and he is a fan of the king Racing bearings so I guess time will tell how long the last and how much abuse it'll take but as of right now I've heard nothing but good things
Well made product. Too notch. MAPerformance has great customer service. Part was backordered due to manufacturer shortage but they kept me up to date and in the loop with the status the entire time.
