Vee Wee,
To bring the CV case to specs with the
earlier open breather cases you have to
establish an open breather surface 5.5 inches above the crank centerline.
Since you will be dealing with both sides of
the case, you must split, strip and clean the case. The weld up requires machining the
surfaces where the case halves come together
as well as the top of the breather tower.
Unless you have access to a heliarc welder
and a good sized mill, you'd be better off buying a good used case. Both alternatives
require a complete teardown and reassembly.
You will have to balance the cost of welding
and machining against the cost of a used case.
Joe
Oregon Peformance Products
http://www.spiretech.com/~opshroud