Jack, all the cam manufacturters have "street rollers", and for the FE, the lifts range from .610 to about .660. Full comp rollers are about .750-.780 lifts. I think with SBC's, the lifts are less. When I bought my cam from crane, they said nothing about it. I also bought their pro series lifter, a shell type roller lifter compared to the standard bar-bell type, of which the shell is a little lighter. I heard that there are only a couple of roller lifter manufacturers, who sell to multiple cam manufacturers who then sell them under their name. I know crane makes their own FE roller lifter. I don't know who makes the comp-cams lifter. I've heard from several people that crane may have a better quality product than comp-cams.
I got 900 miles on my car now, and I guess I will need to check the spring pressures soon. The engine is running fine now, and hopefully for a long time. I run titanium retainers. I also run a
oil cooler, as I heard that heat destroys valve springs, and it is the
oil that cools them off, making them last longer. There are coated springs that apparently help the
oil absorb the heat, to make them last longer. There are titanium springs as well, which last longer, although they are very expensive.
Initially, I had 20W-50 , and I could only achieve about 45-50 lbs pressure, which is taken after the oil filter and cooler. Since I changed to Mobil 1 10W-30, I now run about 70 lbs pressure, which I know means a higher pressure to the bearings, and a higher oil flow rate for better cooling and lubrication of engine parts, i.e.valve springs. I think this will provide better lubrication for the lifter as well. Whether it makes a difference or not, I don't know.