853 heads

[fast00ls1]

i have a 2000 camaro ss i bought,i am trying to find out what it has done.The heads on it have a casting number of 853 and a part number 13429855 i cant find anything about these and if they are stock or not . and if anyone knows i have a intake manifold with part number 12561184 is this the z06 intake manifold

[mrr23]

853 are stock heads for 97-00 ls1 cars. both my cars have those casting numbers on them as well. http://smokemup.com/tech/ls1.php