ACL race main bearings for NA/NB

As low as $86.99
In stock
Part number
04-66100
ACL race main bearings for your engine.

Main bearings for 1990-05 Miata engines. These are quality ACL race bearings, for maximum strength inside maximum horsepower engines.

Available in stock, 0.25mm (0.010") or 0.50mm (0.020") oversize. They also come in 0.025mm (0.001") oversize.

Included in our engine rebuild kits.

Crank measurements in mm and inches

  • Stock = 49.938-49.956 / 1.9661-1.9667
  • .25 / .01 = 49.704-49.708 / 1.9569-1.9570
  • .50 / .02 = 49.454-49.458 / 1.9470-1.9471
More Information
Part number 04-66100
Fits Exocet? Yes
Manufacturer ACL
Proposition 65 Warning: Cancer and reproductive harm
Flyin' Miata exclusive No
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