Need help with Hydraulic Roller Lifters

[Dwight]

I've seen Keith Craft's 427 s.o. / 487 c.i. on 7,000 rpms a couple of times and 6700 several times
No spring or lifter problems for thousands of miles.

Dwight

[philminotti]

Hmmm. I'd be more suspicious of coil bind or bad geometry than over-revving for spring failure. My engine just rolls over at about 6k, but springs don't break. There are short travel hydraulic lifters for the FE, but I'm not sure that's the problem here. And Brent can certainly correct me, but running a typical roller juice lifter to 7k is absurd. Solid roller for sure but not hydraulic.

[philminotti]

And don't run solid rollers on a hydro roller cam. Just don't.

[blykins]

I compare notes with a lot of the other builders.

The FE that Keith built that went to 7000 with hydraulic rollers had titanium valves...big difference.

You're normally going to see 6000-6200 before you lose control of the valvetrain on a hydraulic roller FE. You can do things to extend that, but some of them start getting exotic....titanium valves....short travel Morel lifters with *solid roller* spring pressure, etc.

The Morels are pretty much the best you can buy. I've used a few of the other brands, including Crane, but I can't attest to where the pushrod seat is.