@jtpantera posted:The 4 (dot) to determine open verses closed head is a relevation to me. This is an extremely beneficial data point as common understanding among many knowledgeable Pantera owners has been that it required intake removal at the least to see casting marks that could identify.
I have open and closed heads in storage that I will eventually inspect to confirm. However before I make my way over there, can anyone else confirm the accuracy of this casting mark as an indicator of open verses closed combustion chambers on a 4V head?
Per the books (Ford Parts Interchange) it is what it is .4 is open camber..well in the old days nothing was that precise..
at least we have 2 evidences
1) René..has a .4 head ..OPEN Chamber
2) myself has .4 heads (on shelf) ... OPEN Chamber
(ok, this is not an issue you just need dif pistons to get the compression up to 10/ plus 
...and a head overhaul to make them adequate for heavy valve lift..George Pence did a wonderfull write up on this..).
AND.. the Pantera is wild even with so called 27x horsepower!!...is the least issue to me honestly..
Matthias/Stuttgart