Trying to be helpful... The valley breather is a tough nut to crack. A lot of oil in suspension there. You need a large amount of well thought out baffling to succeed. Also, with any breather, the larger the inner diameter of the exit tube, the lower the velocity. Velocity is the common culprit of oil escaping from breathers.

I now have solid valley plates for RB blocks. I had a bunch of people ask me to make them so I went ahead and ran a batch. If you want one you can order it from Hughes or Mancini Racing. Part number is AR300A. Don't forget the A on the end. The AR300 is the two piece cover, the 300A is the one piece version.

Looks Great Andy! How did the valley breather work out?

Are the Batwings also available? Standard and/or MW port?

I haven't run the engine with the valley breather yet. I'm in the middle of complete engine re-shuffle with my 470 engine turning into two different 470 engines.

I do have batwings on hand in both the std port as well as the MW port size. I haven't tried the MW port size on an engine yet myself but I've sold some to folks who gave me a thumbs up on the fitment. There are a lot of different MW port sizes floating around as well as different gasket sizes so it wasn't a perfect one-size-fits all solution.

It will be interesting to see how the new TF270s will fit into the "MW" port size arena.

What are "Bat wings" ?