906 head capabilities?

Speedmaster shows a 1.81 valve that’s 5.424” long, so that’s likely what are in those heads.
Longer than what they really should be if one were trying get the intake/exhaust tips heights evened out……..and not have to end up sinking the intake valves a bunch to make that happen.

As bent up as those pushrods are, makes me wonder if they were really up to the job.