Used set of 074 heads I've had for 30 years they do need some combustion chamber work they were on a drag boat in the late 70's and were only used a short time 4-5 events and had detonation no seats dropped, they have never been surfaced never ported intake exhaust ports in touched all rocker bosses are in good shape because of the minimal use water passages are perfect probably a maximum of 3 hours of water in their life, dates on heads are 3/30/78 and 3/23/78 look at pictures all damage shown I was getting ready to fix them but decided to see if they sell as is first.