David, you asked about aluminum pushrod tubes or not in your TR4A head.
I assume you have no worries.
I agree with TerriAnn, about early and late heads.
I have seen TR heads of mine where the pushrod tubes passed the rust test.
They did rust, so I knew they were not aluminum.
As I recall, the aluminum tubes will appear smaller in diameter, since they
used an expansion tool of some sort to fit them. The steel tubes were
simply pressed in, I believe.
About 20 years ago, my fairly late TR4A's head's pushrod tubes disappeared
in a hot tank, even after my warnings to the machinist.
Keith Edwards
Suffolk, VA
67 TR4A 72418L and 3 other complete TRs
-
Keith Edwards, et. al.
VDOT Suffolk Information Systems
|