Update 09/12/14 - In Production:, precision stainless steel pushrod tubes Options

[ChrisFoley]

I'm working on a prototype set of stainless pushrod tubes.
Advantages:
Precision machined heavy duty ends for greatly improved o-ring retention
Stop using paste sealants to keep oil from leaking at pr tube seals
Lower heat transfer than mild steel
Slightly smaller (3/4" od) tubes for better stub pipe clearance without need to dimple the pr tubes
Available in custom lengths, longer or shorter
Never rust out - never need replacement

I'm also considering using separate oil return hoses from both rocker boxes so that the pr tubes no longer have to handle that function.
That would allow the smallest possible tubes without the p-rods rubbing.
Machining the ends would be simplified, thereby lowering the cost of production.

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Your thoughts?

Edit 09/12/14: These are in Production. Go to Post #26 for add'l information.