there is no sure way of sealing the two newly divided chambers after
the header tank is welded on.

Why not split the header in half lengthways, weld the divider in place, then
replace the header halfs welding the divider into the join?

More on the water pump modifications shortly.

OK, thanks. Please keep us all informed.
Regards,
John Slade

That sounds like it should work but it is just as easy to make a new tank.
I was going to saw a slit in the tank and weld in a divider as a first try.

Paul Lamar
 
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