The RB20 design is awsome. The famous Nissan stud girdle, piston oil squirters, low compression pistons for boost all wrapped up in a very easy to work on package.
Mix this with a decent regiment of maintenance and you’ll be happy for a long time. I beat up RB20’s horribly when I was in japan. I would overboost, run lean, use bad gas, make repeated high speed runs over and over and the damn things just kept on ticking. I would detonate so badly my spark plugs would have no no ground strap left. I’ve had the turbine section glowing red hot and still raced it.