To properly do a leakdown test you need to remove the cams.If you were to cheat and not remove the cams you would have to try to hold the crank in one spot so it does not turn.. And this test would not tell you if you had a stuck oil ring anyway. It would tell you if you had a valve issue, or a compression ring issue. So this test would not even tell you if you had a stuck oil ring.You work in a motor shop?? shawnOriginally Posted by MoonRaker