Some Break-in Ifo from Crane
The pamphlet I found that specifically mentions spring pressures is from their Australian website oddly enough... The one from their American site only gives a vague reference to "race cams requiring high(??) spring pressures with dual springs"
[ame="http://cranecams.com.au/pdfs/Flat%20Tappet%20Camshaft%20Break-In%20Procedure.pdf"]http://cranecams.com.au/pdfs/Flat%20Tappet%20Camshaft%20Break-In%20Procedure.pdf[/ame]