My 88 Mera with a 3800 Series III swap ran a bit warmer than I like last summer with the AC on in the 100+ temperatures and a 3 row Champion radiator. My research found that a 2 row aluminum radiator with 1" tubes will cool significantly better than a 3 row aluminum with 5/8" tubes due to better airflow. That will be easy I will just change to a 2 row radiator except nobody makes a 2 row for a Fiero. After way to much time on the computer I found Brice Thomas Radiator, a division of C G & J Heat Transfer. They built a custom radiator, all Made in USA for my car, it is a very nice part. They build radiators for big trucks and heavy equipment and use the same gauge material in their auto radiators, I like that. They charged me $600.00 to build it, about half what Griffin wanted for a custom 2 row radiator. A bit pricey but it's worth it to me to not have to worry about overheating with the AC on when it gets really hot, think global warming.
I measured and measured before having it built and was pretty close. I had to modify the upper core support a bit but it worked out OK. If I were ordering another one 2 changes would probably make it a drop in, all you would have to do is trim the rubber cradle cushions for the wider core, the same as you have to with the 3 row Champion. I will update how it cools when the weather warms up.
Disclaimer, use at your own discretion. I can not guarantee that this will be a perfect fit but here's a drawing with the updated dimensions I would order today based on the radiator I installed in my car.
