Soup-Up was a very short lived, small format magazine published by Harle Publications in Canton Ohio (with offices in New York). Publishers were Joseph Hardie and Ray Kelly who also published Speed Mechanics and Custom Craft.
Only three issues were published, and then it was re-titled as How To Hop-Up Your Engine. The volume and series numbers carried forward from its predecessor.
The table of contents can be seen by clicking on the icon.
All cover images and table of content pages are complete for this title.