No changes have been made. They did provide a reservoir for oil to settle in below the cam, so, at start-up the lobes get a bath before slapping the rockers. Probably better to get on, stand it up, then start,rather than on the understand. And, keep the idle right, even if it means fiddling with the adjustment every day. I alwAys had to raise it when cold, then gradually drop it as it warmed. I SAY always,  really, only after I did the cam, exhaust and jets... ahhh, but what a small price to pay for the fun of doing it and the results..

It's a known problem that if you idle it too low, below 1000 rpms you'll have less than 5 psi.

But you'll have over 50 psi at superslab speeds.

moral of this story... don't idle on the freeway.