I checked the article on heads in the Mopar Muscle Magazine archives www.moparmusclemagazine.com/techarticles/5115_cylinder_heads/index.html) and it does not mention the 213 head. 440source.com lists used 213 heads for sale w/o any explanation other than they are open chamber which you already know. My guess is that it must have been a small production run w/ characteristics similar to other more numerous runs or it would have been addressed in the article. Sorry I can't be of more help. Paul L. '63 Sport Fury 440/727 http://www.1962to1965mopar.ornocar.org/ml-lennemann63.html Sean B wrote: > > Anybody know what "213" big block heads are? I've found a set. They > are open chambers. > > Sean ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.