Hey guys so I need help. Doing a rebuild as I spun 2 rod bearing. Have a new crank and have the eagle forged h beam connecting rods. Crank rod journals are measuring at 51.7mm and the eagle connecting rod measurements are 55.0418mm. Trying to figure out what bearing I need. I for some reason can’t do the math correctly please help. Have everything else except the bearings.

 

Up to you if you want to run the oem bearings or something like the king under/over sized. I would buy a couple extras of the oem rod bearings, put whatever size your block says you would need. Plasti gage it and see if you need to go up or size.

 

You need 0.034 - 0.059 oil gap clearance so

55.0418 - 51.7 = 3.3418

Minus the oil gap clearance gives a bearing TOTAL thickness of 3.3078 - 3.2828

Now divide by two since the bearing is two halves,

3.3078 / 2 = 1.6539

to

3.2828 / 2 = 1.6414

You won't be using OEM bearings for this since the OEM application doesn't measure the stock rod end (they're all milled out the same inner diameter), it only accounts for machine differences on the crank journal I think stock rod bearings are like 1.5mm. Your eagle rod pin diameter is larger than stock.

Yes plastigauge all your bearings, it's cheap insurance to make sure everything actually calculates out right.