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[TorqueInc]

Pick up a pac or Manley catalog
Or lunati or comp for that matter

Plenty of springs to be sourced and retainers,seats,locks to go with them

[HD Street Performance]

Exactly
And now we are back to the same place we were at in the last beehive discussion. Matt the point I was trying to make about rate is seat pressure is not the whole picture and when the rate is too low despite a lot of preload, the seat pressure, the beehives are not necessarily going to control the valve that well. Especially with the lack of rigid pushrods. Think pole vault. This is another reason I have changed away from beehives springs, for a higher rate. Nothing you don't understand I'm sure just may not agree with.

[MCE]

I'm not disagreeing at all. Spring rate is super easy to measure/calculate. It's a simple linear equation (9th or 10th grade math).
I'm going to continue using beehives, for a variety of reasons that I don't feel like litigating here.

-Cheers   

[MCE]

Beehive springs/retainers have less mass, (one of their advantages). That alone will minimize pushrod deflection
(pole vaulting as you call it) during an aggressive valve opening event. TI retainers help, but a
double spring is still going to have more mass than the beehive. F=MA

Then there's the issue of spring harmonics, beehives don't have a single resonant frequency, it's spread out over
a wide range to minimize harmonic "ringing". Probably not an issue on these engines, but IDK for sure. 

I'm not here to convince anyone or change people's minds. Use whatever you feel comfortable with!

-MC

PS: I'm going to run it by Darin Morgan when I see him next week.