If you work on any high-power adder or high rpm engines, chances are you will see some fretting on the bottoms of main caps and the backside of the upper rod bearing. Even when the tune is right you will still see minor signs of movement between the parts. To help combat this we coat the bottoms of main caps, the backside of the upper rod bearings and both main bearing shells with an anti-friction spray. There are a few companies who offer this, Dow Corning and Seymour to name a couple. We also like to prep the surfaces with red Scotch-brite and clean with lacquer thinner prior to coating.

Nick Jones
Automotive Machine
Fraser, MI
February, 2021