Yes it is true. Smarter people than you have proved it. Ruined valve stems & locks doesn't mean that it was a spring problem.
D. Vizard quote from his BBC book:
[1] 'All this [ BH spring ] adds up to to a spring that needs less of it's own spring capability to control itself & therefore has more to control the valve train'.
[2] 'Typically, you can drop 15 lbs on the seat & as much as 40 lbs over the nose & achieve the same RPM as a good conventional spring. Also even with the reduced spring forces, the valve train is better controlled through out the rpm range.'
Four Stroke Performance Tuning by A. G. Bell.
On BH springs:
'Its reduced diam at the top allows for a lighter retainer. ...it allows a spring pressure reduction at full lift of of around 10-20% without any reduction in safe engine speed.....cutting both parasitic losses due to friction & valve seat wear. This is possible because of the BHs superior harmonics....Each coil increases in diam compared with the coil above, so each coil has a different natural frequency which helps dampen spring surge'
There was a bad batch of Comp Cams BH springs I believe about 15 years back, which CC acknowledged.
