Clevite vs King rod brgs.
 

How would you rate them for a 10 sec motor.

The Kings look nicer to me out of the box.

In my experience with both, King bearings are more concentric than Clevite

Have you seen issues with other brand bearings that you have had in the motor?

I had them in a 10 sec engine for a decade.
Doubt it matters a hill of beans though. FM, King or Clevite will all get it done.

Fact is as pointed in Dragncars reply above , if your looking for a bearing that will help keep your bottom end together then your certainly looking in the wrong place .

The Delta wall factor a given bearing might have as compared to one another can be a small help in terms of a block or connecting Rod , or connecting Rod bolts being pushed to the edge of there limits .

Dirt embedability is another factor that should have no place in the race only motor consideration.

When we were killing bearings in the Pontiac nitro engine every weekend, I had a couple long conversations with Bill Miller. (BME) By this point we couldn't get any "race bearings" for our billet crankshafts because they were -.030 from all the damage and the learning curve. He told us "it doesn't matter what bearings you use. There were no race bearings when I began running the Fontana engine in my dragster". What matters is the oil clearance and the roundness and straightness of the parts" Turns out, as usual, he was right. Once we solved these issues, the bearings lived a long happy life. We ran our fastest times on -.030 passenger car bearings. Not by choice, it was all we could get.

IMO, the answer to the OP question, is personal preference. King bearings are pretty, no doubt about it. They are round too. I like the 3/4 groove mains in the ugly FM race bearings though. I have successfully used King, Clevite, ACL, Vandervell, FM/Speed Pro, even a few sets of Moraine 400-600. I believe Mr. Miller.

Oil clearance is the number one priority. We find they vary a lot. Once the clearance dictates the bearing of choice, we modify the oil ports and grooves to fit the application.


Clevite H and P bearings are the same material. One isn't a passenger car application and the other "high performance".

I didn't know that. I always made that assumption. What is the difference between those two series? I seldom use Clevite but sometimes they are the easiest to get.

The main difference is the amount of eccentricity built into the bearings. P is considered high, H is medium and V is considered low to medium.