Thank you Brent.
Lets say one uses the Ford 3/8" valve.
Looking at CC LXL hydro roller for high ratio rockers and optimized with lower acceleration and a softer closing ramp.
Catalog mentions lobe is good for road race type engines for extended high rpm use.
One also uses a lower mass beehive spring with lightweight retainer.
Would limited travel hydro roller with the FE heavy valve help lifter issues at 6000+ rpm?
You could try to throw a lot of spring pressure at it with short travels, but it would be much easier to use a cam lobe that's better designed for the application.
Just because the lobe states it's for higher ratio rockers with lower acceleration and softer ramps, it's specifically for an LS engine, which uses an 8mm valve stem and a *much* lighter valve, along with a much lighter lifter, etc. You will very quickly lose control of the valvetrain with a 3/8" stem valve and a lobe like that.
FWIW, I do use some of the LS lobes, but only on the exhaust side and only with much lighter valves.
Back when hydraulic rollers in FE's started becoming popular, everyone was trying Xtreme Energy and XFI lobes with 3/8" stem valves. It was very quickly apparent that an aggressive lobe just wasn't working well as all the engines would completely lose control of their faculties around 5500-5800.
You will need to lose some valve weight, pick another lobe, or both. And as the rpm goes up, the relationship between all of the valvetrain components becomes a lot more important.
