Clevite H and HX bearings, developed for NASCAR racing, are appropriate for any type of racing motor.
HX Series bearings feature medium eccentricity, high crush and hardened steel backs with a thin overlay, plus enlarged chamfers to accommodate greater crankshaft fillet clearance. Additionally, the bearings have no flash plating for improved seating.
The HX series bearings have and .001 extra clearance
The biggest benefit of coated bearings is preventing damage during cold starts and events where oil starvation is evident. Starting your car is almost the worst thing you can do as the oil has had time to drain out of the engine back into the pan. The oil is cold and thicker and takes time to get circulated throughout the engine, including to the crank bearings. The added dry film lubricant coating acts as a barrier between the bearing surface and the crank journal. Other benefits are less friction and longer bearing and crank journal life. The special coating also has moly and other ingredients that retain oil rather than repel it.
This coating process was developed for and is used in race engines, and applied to street and daily-use cars to help yield more durable engines.
*Sold individually. Qty. 6 required for complete set