Solid roller lifter failure

[Excaliber]

Well the situation is trying to preserve monies all ready invested, cam, valve springs, pushrods primarily. Doesn't leave a lot of options. Back to solid roller or POSSIBLY pressure fed solid roller. PF roller may require another set of push rods though depending on size/legnth of the new lifters.

Solid roller cam profile; would that rule out hydraulic rollers 100%?

[blykins]

Ernie, you'd have to have very light weight valvetrain in my opinion to get away with running hydraulic lifters on a solid roller profile.

I tried a custom camshaft in a 445ci Windsor once. It was a hydraulic roller with very steep ramps. Even with titanium valvetrain components and 150/425lb springs, it was lofting the lifters and floating the valves. Not good.

Berm,

That is a very large cam to peak at 5900. I'm wondering if you've had excessive lash problems, or even valve float issues all the time. Something is up as that cam with those good heads should make power up high.

Also, what is the seat pressure on those springs?

Normal SBF install height is around 1.800-1.850, so if you have 400lbs at open pressure, that's not enough. Nowhere close.

Your seat pressure with that cam should be around 200-250 lbs with about 550 at open pressure.

The springs could have caused both problems.....loss of valvetrain control, and loss of power up top.

I would check seat pressure and post back here, but at this point, I would send them back and let us help you get new ones.

If you want to keep that camshaft, then a set of pressure fed lifters would work just fine. You can get a set of Comp pressure fed lifters for $339.