late model slant six head

halfafish said
I believe the cam is part of this equation as well. A hydraulic cam has a groove in the rear journal that has to do with oiling. A solid cam does not. I put a solid valve train in a hydraulic head, and I remember having to regrind a solid cam as well.

My disclaimer, and other experts please jump in here if needed. I did this swap a while ago and may be fuzzy on the details, but I think this is right.

That was what I said. The valve train must match the engine, not the head. If hydro engine, hydro valve train, if solid lifter engine, solid lifter valve train. The hydro cam does have the groove, where the solid cam does not. But if you are just swapping the head, the cam is out of the equation.