Want to make the claiming rule effective? In addition to the open claiming have the series claim an engine from the top ten at random in every class, each weekend. Then put that engine up for auction after it is teched and reassembled. Takes the stigma away of being “that guy” yet forces everyone to keep it honest.
In this case the series can hand the racer a new engine package (since they are the importer anyway) and $1000 then sell the claimed engine afterwards and still break even.
That would take a bite out of the gentlemen’s agreement scenario.