[Binx]

Installed valve spring seat pressure.

First off, Ol' Ron gets full credit for this method to measure installed height pressure...

With fully installed valve assembly resting off the lifter, measure the spring from the bottom of the guide to the top of the retainer with a divider or dowel.

Find or grind a bolt and nut to match this dimension.

Disassemble valve assembly.

Place a bathroom scale on the table of your drill press and cover it with a square of plywood so it doesn't get damaged.

Chuck an old valve in the drill press with a small block of wood handy.

Set the spring and measured bolt/nut assembly side-by-side on the plywood with the wood block over the top of spring.

Pull chuck down until spring is even with bolt assembly then read scale.

Note: Every valve may have a different reading.

Lonnie