The heads in the PIC is a #10 made 11/05/1981 . I can only tell you how they would have left brodix 36 years ago . Port volume was 210 CC . Most common chamber was 67 CC .The intake valve was 2.080 and exhaust valve of 1.60 . They would out of the box flow 262 CFM on intake @ .700 valve lift and 168 on exhaust. The info came straight from brodix. The heads need all of the hardware but the valves are there n guides are good. We took them to a machine shop n head them checked they are good to run. I think they are worth at min. $350