Been doing some study on them, as I got 2, 1 will be going on a flathead 6 at some point in time. Seen a few bad reviews about them, mostly having oil ingress under the cap. Yeah Yeah know all the standard responses of why. In all my years of fooling with this stuff never have taken a GM V8 HEI all apart. Anyway on these china specials, there is a felt ring that fits into the center bore that the shaft comes through at the top, and then has solid plastic washer over it (no oil drain there). Down in that cavity there is no drain back holes at all. Those 2 parts essentially do nothing. Soon will take a GM one apart to see what is going on.
I'm also thinking that these are not a true plug n play deal. Because of the lower shaft and oil pump drive. I will look into that more when the other projects are done.
Anyone else have more input on these.
