For functionality the one piece is best as long as it fits right. They are a bit of a nuisance taking on and off. If you change to a multi-piece I wouldn't consider it an upgrade.The one piece fit,s nice, but it is a little work get it on-off, and a little extra work when checking valve lash, I have oil leaking past my guide seal,s so I was going to pull it down to look at some seal,s, (upgrade) get a good one that is not a one piece. That,s it, thank,s
And if you don't understand why pull a valve cover and crank the motor over with 220/500 springs, the studs flop in the breeze.. Added bonus with a girdle, no worries if the set screw for the poly lock isn't quite tight enough...don't ask how i know that:shock:I recommend a girdle with any solid roller, no matter how high you spin it. JMO, YMMV.