i just recently acquired a 1972 lt-1 from a friend but for some reason the heads dont match to the # for that year. block # is 3970010 but head # is 458642 does anyone know if these are good heads?ive looked on mortec,it does not say anything about them. or valve size,cumbustion chamber size, runner volume.motor has been rebuilt to stock specs, heads were reworked also. original owner was his only uncle which has been dead for a couple of months.would appreciate some advice from the more experienced one,s on this board. thanks.

 

Recheck the # it is probably casting # 458624

 

use them for boat anchors.

624 casting heads have 76cc chambers and are basicly junk. and they are very prown to cracking.