70 has a problem with the temp creeping up

Sounds like your radiator is right the limit of being too small. The radiator should be large enough that it will maintain temp at 35mph or faster without a fan.

It is better to go wider and taller (adding surface area) than it is to add cores. Of course this only works if you have the space to go larger. If you are already at the size limit then you have to add cores or bigger cores.


Chuck