[bdonally]

Finally getting to reassembling my heads (new guides, reground seats and valves) and I have a decision about the valve spring setting.
My springs are not stock - they are longer than stock, with a lower spring rate.
They were sourced from CMW several years ago.
From info I have found, the stock springs have a rate of about 290 lb/in, and installed at the 34.5mm height the initial force is 130 #. At 11.5mm lift, the force rises to 262#.

Turns out this is bad information - or at least I interpreted it incorrectly

My springs have a rate of 260 lb/in. I can set the initial force the same as stock, then the force at 11.5mm will be 254#, a bit lower than stock.
Or I can set the springs so that they are the same as stock when open; in that case the initial force will be a bit higher than stock, at 136#.
Or I can choose something else, including setting the intakes and exhausts at different points.
The force rise at 11.5mm lift is 127#; at 10mm it is 109#. I can't change those values.

I suspect that for a mildly tweaked engine with stock cams, none of this really matters, but I have to re-shim in any case so thought I'd seek some input.