Hi cyclone 32,
I saw your reference to CAW valve covers and have been meaning to respond. I have heard speculation that CAW stands for "Colorado Aluminum Works" - still others say that it is a monogram of some guys initials - who knows for sure. My research has turned up zero documentation on these things.
Also, I have only ever seen one of them - and when I did I bought it! If you've never eyeballed one before - here you go:
As you can see they ain't flashy - just a rough casting - and you'll need a stud kit to use one of them on a 235.
I intend to use it on my 216 build . . .
I guess they are kinda rare cause I have never seen another since.
BTW you could post on the 'Parts Wanted' page by following the 'Classifieds' link on the left.
I have acquired several 216 goodies this way.
Happy hunting.
regards,
stock49