Whaooo, we're getting somewhere!!!
Never heard before about this mallory alloy, that's what I love about this forum, lots of guys with slightly different perspectives and backgrounds, so plenty of proper advise given...
This is what I found about densities:
Iron: 7.87
Lead: 11.35
Mallory alloy: from 17 to 18.5
I did my 1st Jonghi 3 years ago with lead, despite not liking one bit the shape of the slugs that came out of it...
On this one, the slugs were moving about quite a bit but their weight is pretty consistant within 5 grammes which tells me none of it departed towards the bottom of the crankcases.
So I have a good reference for the weight to be added, rather than just fill the holes flush.
The big end and ancillaries are perfect, I'll leave them as is at this stage.
Just a bit of work, filing and polishing, to clean up the rod...
I also have a full set of NOS replacements, rod race, pin, nuts, rollers in a jar full of oil...
Thanks again!!! Well appreciated!!!
Patrick