How much weight can you remove from an LS and still be useable?

A study in weight reduction on an LS block. How much weight can you remove and still have a useful engine block? I guess that depends on the intended use.
I’m cutting as much cast iron out of my 4.8 / 5.3L block as possible, what will the weight savings be?
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[@s.m.aggies7220]

Good trial and science would be nice for backyard artwork or a table. :)

[@AllisonCustoms]

Thanks, it was fun for about 30 minutes and then just tedious!

[@noberet]

Thank you! Very interesting.

[@AllisonCustoms]

Glad you liked it!

[@ryanaustin1970]

The company that makes the foam engines is called P-ayr i believe the ls is model 2046

[@AllisonCustoms]

Thanks, I added a link in the description. I appreciate the backup!

[@MikeSTGL]

How much lighter than an aluminium block ?

[@AllisonCustoms]

I wish I knew. If any? I’ve got two aluminum block LS engines, but they are both ready to run.