King Race XP Main Bearings - NA/NB Miata

King Race XP main bearings for the 1.6 and 1.8 engines in the NA and NB Miata. This is a full set of five pairs, made for built engines with steel crankshafts that see high load.

The XP series is King's race bearing. It's a three layer, copper based bearing with King's pMaxBlack overlay, which is hardened to carry more load than a standard overlay. The main shells also use King's 90 degree U shaped oil groove, which keeps oil flowing while leaving more bearing surface to carry the load.

They're made in standard, STDX (an extra .001" of clearance), 0.25mm and 0.50mm sizes. If you need a size that isn't listed, email me and I'll get you sorted out. The thrust bearing isn't part of this set. I carry the OEM Mazda thrust bearing as its own listing.