It's been couple of years since I've started a new engine. The last time I was told to fire it up,then rev it up to 1500- 2000 RPS for 20 min. to breakin the cam. Is this still the way? The paper work with the engine never said anything. It's a GM crate engine. I put the Comp Cam oil to protect the cam lobs.Just askin, Thanks aor any help.