Hard to get a grasp on what is really up with lifters. I talked to Butler who informed me oil restrictors are needed for all solid rollers. I contacted Crower who said oil restrictors are not needed and not recommended. Hmm.

Talked to one vendor who told me running solids on a hydraulic cam will shorten the effective duration and another who told me the duration will be increased. I don't think they know any more than the rest of us. They both specialize in Pontiac, sell Pontiac parts and build Pontiac crate engines. I can see the duration seeming smaller with a hydraulic that bleeds down too much oil but if they are operating as designed the lash should be zero thus the solids would have the shorter duration due to the lash setting.

But I do know these Comp hydraulic rollers are junk and will be replacing them. Not sure just yet but will most likely go for a cam swap and run solid rollers. Probably have to set the rockers even less than I've had to do with the Comp hydraulics.