Iron casting, 6 cylinder, volumes in cylinder head, exhaust valve recess 4.53 c.C., intake valve recess 6.32 c.C., starting valve recess 8.40 c.C., pre cup 56.00 c.C., pre cup outlet in head 6.95 c.C. Plus or minus .25 cc on all volumes, total volume in head 82.20 c.C. Porm 1.00 c.C.