About a month ago I had a blueprint crate 383 dropped into my camaro. After about 400 miles on it I'm still getting a puff of blue oil smoke out of my exhaust and I'm not sure if the rings (moly) and seals are still seating in or if something may be wrong. I'm running conventional 10w30 castrol in it and it has a roller cam so they (the manual that came with the engine) said that an oil with the extra zink wasn't needed. I'm not seeing any smoke while driving or at acceleration. (It did it a couple times one day a couple weeks ago but I haven't seen it before or since.). The mechanic who dropped it in keeps telling me its fine that the rings are still seating but I'm beginning to arch my eyebrow at it. Anyone out there have any experience with this happening in a new crate engine? Normally a puff of blue at start up would have me looking at my valve seals but in a brand new engine? This is my first so I'm just wanting to be sure about it. I've been doing an easy break in on it.