Best Fix: aluminum radiator (read good things about it, does anybody have pics of it, both alone and installed?)
Good Fix: swap radiators with your other SVX as soon as you can.
Home Depot Engineering Fix: drain radiator fluid. Find the top hairline crack and lightly grind the inside of the crack with a dremel (make the crack like a rounded canal). Sand the entire surface with 400 grit sandpaper, clean all dust with a cloth dampened with a bit of acetone. Mix some JB-Weld as accurately as possible and apply inside of the crack canal and all around it. Let it dry for 48 hours if possible.
The last fix is ghetto but saved me on two similar occasions... I eventually proceeded to get new radiators in those occasions, but the fix was holding up strong.
Remember (this applies mostly to performance upgrades but it's a good guideline nonetheless - don't ask me how I know):
Reliable + Fast = NOT Cheap
Reliable + Cheap = NOT Fast
Fast + Cheap = NOT Reliable
Good luck,
Walter
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1995 SVX Green - now 5spd! ..::|SOLD|::..
1991 Talon TSi AWD (~400 whp pump gas)
1993 Civic CX Hatch (daily driver)
1999 Ducati 748S (built 996 engine)