I saw this on another site do not know if you can use them :
(Mortec numbers site says they were also for "69 Z's)
I have a set of 1970, 370 HP, LT-1 heads casting # 3947041-X
These heads were both cast on March 3rd, 1969.
Heads are 64 cc chambers, 165cc intake runners and 65cc exhaust.
They have 3/8 screw-in studs and 5/16 guide plates.
2.02 intake valves and 1.6 exhaust valves.
Heads are unmolested, never ported or polished, and appear to have never been surfaced.
They have new valve guides, umbrella seals, Z-28 500 lift valve springs, and a 3 angle valve job.
These are fresh and ready to bolt on.
E-mail me for pics.
[email protected]
$500.00 plus freight, deliver lower 48 only, or may pick up
http://www.mortec.com/castnum.htm