Solid roller lifters...

PROSTOCKTOM said
You might really want to look into cryogenic treatment on the springs. I have at minimum my springs and rocker arms treated on all my engines. The harder the intended use the more components I have treated. On my 499" engine I even had the Victor intake treated to relieve the casting stress since I knew it was going to get heavily ported and I didn't want it cracking later.

In the link below you can see a short video from Circle City Cryogenics that has my K-Motion valve springs, a USPS box with my rocker arms hanging out, and my Victor intake.

The process makes the valve springs last without loosing pressure over time.

Tom

People told me that my way of using was inadequate and my springs were at the limit when new anyway which caused early fatigue. Idea is that I should let the springs heat soak before hard drivibg which i never did. I decided to get harder spring so even if fading occurs I can live with them.
On the other hand looking at ot from wallet perspective, buying 450$ springs every 3 years and rebuilding lifters for I dont know how much just as often makes me think that big *** solid flat tappet cam could have been fun also ;-)