Yep...the Jenkins engine book. I hadn’t read the book in years, and I was bored so I pulled it out and realized that at that time, there was no such thing when the book was written what was called at that time (1995) soft honing. But in essence, that’s what he was doing. They would get the engine on the dyno and break it in and make some pulls. They would then pull it down, lightly hone it (IIRC I’m going off my memory but I’m close) and then install new rings. The engine would pick up power every time.
Now, you can either brush hone it with what I call soft hone brushes or there is a new thing being used and gain, IIRC it is CBN to finish the bores that does the same thing.
Guys like Jenkins and Yunick were well ahead of their time. There is so much valuable info in both books I now pull them out every year or so and go through them.
In the Jenkins book you’ll find where he used a PCV valve and pan EVC together.
