The best King Engine Bearings for your build are the XP and XPC series performance bearings — XP for high-output street engines and XPC for extreme race clearances — sized to your crankshaft journal (STD, or undersize like +.25 for a reground crank). Subaru EJ20/EJ22/EJ25, Nissan VQ35 and VQ37, and Mazda Miata applications are all covered, so match the bearing series and size to your engine and your machine shop's measurements.
King is the go-to bearing brand in the engine-building world. Bearings live between your crankshaft and connecting rods, and their alloy, crush, and oil clearance decide whether a built motor survives boost. This collection covers rod bearings, main bearings, and thrust washers across King’s performance lines: the standard XP series with its hardened-steel-backed, high-load tri-metal design, and XPC coatings that add extra embedability for race use.
What to look for: always order by journal size (STD vs. undersize) after your crank is measured — never guess. Pair bearings with the right assembly lube and verify oil clearances with Plastigage or a bore gauge during assembly. If your crank was reground, you need the matching undersize set, not STD.
Popular brands: this collection is dedicated to King Engine Bearings. Builders pairing bearings with forged internals also shop CP Pistons and JE Pistons, and browse Engine Builds for the full parts list.
Shop related: King Nissan VQ35DE STD Rod Bearings · King 52mm Rod Bearings for WRX/STI EJ Engines · King VQ35HR/VQ37VHR/VR30 +.25 Rod Bearing Set · King Miata Thrust Washer Set · Engine Builds · Engine Dressing · Shop All Engines · A Guide to Subaru Engine Modifications
King Engine Bearings FAQ
What size bearings do I need — STD or undersize?
Match the bearing to your crankshaft: use STD for an unground crank and an undersize set (e.g. +.25) for a reground crank. Your machine shop’s journal measurements decide.
What’s the difference between King XP and XPC?
XP is King’s performance tri-metal bearing for high-output street and moderate race use; XPC adds a coating for tighter-clearance, extreme race applications.
Do bearings require a tune?
No. Bearings are mechanical engine-internals parts — no tuning involved, but proper clearance measurement during assembly is critical.
Can I install bearings myself?
Only with engine-building experience. Bearing installation requires measuring oil clearances and correct torque procedures — most owners leave this to a machine shop or builder.
