Solid rollers on a hydraulic roller cam

I should mention that though Comp has recommended .010-.012" hot lash, I personally use .005-.006" hot lash. So with aluminum heads things get a little tight under cold conditions. That is when I just use a solid roller cam. My friends 512 will be able to use the really tight cold lash with the iron heads. Which is fortunate as the build will need the tighter lash to lengthen the cam out some.