906 head capabilities?

92b said

Wouldn't roller lifters need shorter pushrods? And longer valves need longer pushrods? In general.

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Longer valves need longer pushrods in a magnum (read: chevy-like) application, stud mount rocker.
If you have a fixed location shaft rocker, you would need to move the shaft, or use SHORTER pushrods, (and the geometry would suck.)