Need rebuilt L20B cylinder head

[spottedog]

My daily driver 1980 Datsun 720 valve train has always been noisy for the
9 years that I have owned it, and now the noise from the valve cover has
gotten louder!

This engine is a "LZ24" Frankenstein engine, W58 L20B head on a Z24 block,
valve job done by a (incompetent) machinist 2 years ago.
Drove it 13,000 miles since I built it back in 2005.

 

The clattering was so loud under acceleration I pulled the head off and took it to a different
automotive machinist that let we watch as he inspected the head.

 

We found that the head has been milled 0.064", it has one 0.015" cam tower shim
under each cam tower, the cam tower bearing journals are scored and worn out
well out of spec (with the camshaft in the journals I can move the camshaft up
and down enough to hear a "clank" sound
The rocker arms are different brands and different lengths, the rocker arm lash
adjusters are also different brands.
All the rocker arms show heavy wear.

 

I can set the valve lash to spec then a week later the engine runs like shit so I pull the valve

cover and find the lash settings have changed! Usually tighter. WTF?

The camshaft is surprisingly good, no flat or scored lobes, measures out OK.

 

 

 

I then pulled the block worried about any damage, but the crank rod and main bearings
look great, pistons look new, cylinder walls also look great, had my NEW machinist
measure everything including crack inspection (it is a Z24) and it's all good.

The bottom line is I need a good replacement L20B cylinder head with rockers and cam
so I can get this 12mpg pig of a truck going so I can get to work without bugging my
friends for a ride.

I am not soliciting a sale in this forum, I just want to know where I can get one
from a rebuilding company somewhere.

Autozone, O'Rielys, and Napa SAID they could order a rebuilt, but that turned out to
be bullshit. datsunpartsllc had a pricy head but they sold it the same day I got the
money to buy it!

Now I will go to the "wanted" section of the classified adds section of this forum and
see if someone here has a good used one.