I have a rebuilt 323i head .. I purchased it a year ago and never used it ... I don't know all the specs .. I can tell you it has dual springs with dampners and looks pretty good. It's all assembled and I believe it is a Schrick cam in it but can't say weather it was new or just put in.. anyway I'm looking for 200.00 plus shipping and handling. It is SOLD AS IS... I make no claims other than whats obvious ,,, This could be the best buy you make for 200 bucks ..call me 724-375-9450 email jim6540@home.com