Z Heads, 915 casting, 10139 date code?

[64ValiantConv]

Okay, looking allpar.com says the 360 was produced from 1971-2002. How to explain a set of 'Z' heads, casting number 3418915B (missing the 5 in some places!?!), also has the AAWJ360, but with a production date code of 10139? Isn't that Oct 13th, 1969?

I just had these reworked, but before tear down, they appeared to have factory 2.02 valves.

 

[oldkimmer]

.........The 360 head 1st came out 4 the 1970 model year.....915 casting........they had 2.02 intakes and 1.60 exhausts.......4 1971 they came with 2.02s 4 the 340s same as 1970, but the new 360 motor [4 1971 model year] only got 1.88 intakes with the same 1.60 exhaust valve..1972 up got the 1.88s...kim.....

 

[swinger340]

I have a set as well dated late 11/??/69. Mine came off of a late 10/69 dated 340 out of a 70 340 duster. 2.02s/1.60s as well. I dont see them quite as much as O,U,or Js. All 915s as well

 

[1wild&crazyguy]

small blocks.........a 915 is a 915....unless the push rod holes are drilled offset, then it's a T/A head...but still same casting only machined different.

 

[crackedback]

production date code of 10139? Isn't that Oct 13th, 1969?

Correct.