all the electric fans I've seen stock or after market are right on the rad.
Yes, I digressed. 1/8" is fine. I confused my response to you with a PM....I apologize.
The efficiency/effectiveness is based on rating of fan. If you have a light or medium duty single fan and it's not cooling, You will have to go to a super duty fan. I believe same dimensionally as far as height and length, but deeper.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.
