Quote:

In practical terms, it's impossible.
Almost all of the column stiffness of a pushrod is a function of its diameter (not wall thickness), and even a solid 5/16" bar is weaker than a 3/8" OD pushrod with only 1/32" wall. Compared to a common 3/8" .083" wall, it's 53% as stiff.



And a 5/16 solid is weaker than a 5/16 tube.