Set the springs you have to 1.8 and you get 150-415 or thereabouts.
I’m not sure how you’re coming up with that.
Valve lift = .590
Spring rate is 395lbs/in
395 x .590 = 233
233 + 150 = 383
For something that’s going to see a lot of miles, I’d prefer to not have the springs set so close to coil bind.
The 925 is 151lbs @1.800, and coil binds at 1.175”....... so .625” available travel -.590” valve lift is .035” from coil bind.
If one really felt like they needed over 400lbs open load(which only exacerbates the lifter collapse/bleed down scenario) in this application, you’d want to use a spring with a higher rate....... like a Comp 929(439lbs/in).
439 x .590 = 259
259 + 150 = 409
I would say after posting your spring pressures that valvetrain instability is confirmed rather than suspected. (so fixing that should make a huge difference)
Actually, I didn’t see where it was posted what the spring loads are....... just what the springs themselves are.
Depending on exactly how the springs are set up, the loads may or may not be way too light for the application.
