Richard,
Those "rough casting" ZL-1 blocks are a real oddity. I have
as of yet to hear anyone bringing one of those to a useable
state ( post machining ). The cost to do so would have to
be prohibitive. That is, assuming anyone could find a shop
with capabilities to fixture a rough casting, do all the
necessary machining, and get it perfect. The gun drilling
for the oil galley's alone would be near impossible to get
right.
If any members here know of a shop with the capabilities to
perform the necesssary machining operations to bring a rough
casting ( block ) to a buildable state, please let me know.
I'll then bid on the next rough casting ZL-1 block I see.
Steve