Is this an original rad we're talking about? When my original went bad I checked on a re-core. 3core was about $350. 4 core was about $525. Crazy huh? I ended up just buying a replacement 4 core for around $200. I didn't really expect much because you get what you pay for but it has held up so far for about 10 years. I was going to toss the old rad but then I realized the Harrison tanks were worth money to someone(the letter tag was long gone). I recently sold the tanks with the bad core for $100 at a swap meet.