The head volume of the 307 with the 4valve reliefs
is 4cc this is what silvolite is showing.
What other head work are you plaining on doing?
Stock, bigger valves? If you are thinking bigger valves You should unshroud it this will also give you some room to play with the CC numbers.
If you give me the casting numbers off that Head I mit be able to tell if it has been Cut before or not by the list of casting numbers i have with the stock CCs. To me it already sounds as if the head has milled at least once already. If your showing 70.5 cc average Head CCs are 72.38 TO 74.00 with a 194 head being 60.32 cc Being the smallest off all & up to again 72.80
God doesn't like ugly.
