does that mean if i buy a used set of heads an they drop a valve the guy i got them from has to replace them? they looked good said they were good. hmmm no my screw up for not checking them and double check every part. its also as is no warranty on used and even if new they are 2yrs old and being a race compound they will dry rot/crack faster then street tire so imo just man up and quit crying you did a shame on me not once but twice no one scammed you