Why do These Cylinder heads Never show up for Sale??

72DMag said
@rumblefish360 Do you mean when they came out and being sold they were expensive?

Yes

or do you mean cause of them being rare they are expensive now?

No, but that may add to it.

Also true about there being shaft style rockers that allow oiling through pushrod like the magnum. But you are now limited to a max of 1.6 ratio rocker that way...

Not true, only for a Magnum head it would be. Below is the reason.

Lastly I've heard about the t fitting but have never done it.

This mod allows for regular rockers @ 1.5 ratio to be used.

So, in actuality, a SBM can use all 3 above rocker ratios, head style attachment dependent.