[transam1972]

thanks 71WARBIRD..I am guessing you can read the cast # in the photo?...I know nothing regarding numbers and how things worked..another member said he would not call them SR heads..but what would you call them?..obviously I know 100% it is a SR block from 1973..but the heads are 1972...I am now only guessing that they were all put together at the time of the new block install....o.k., so the block cast date is J053 or oct. 5th 1973...the heads are a year and a half earlier than the block...obviously the block cannot be installed until Oct. 1973, at the earliest....the dealer would not stock H.O. heads?...if the dealer ordered heads at the same time of the engine, would they get a set made a 1 1/2 year earlier?...the heads are 5 months older than the build date of the car..and does not a cast number of D132 mean they are SR ?...and do the heads come fully assembled, ready to bolt on...so strange??...can anyone make any sense out of this?...thanks!