This paper presents a revival of FORTRAN 66 code which calculates flow through curved pipes. Results from the code were originally presented in [Greenspan, D. Secondary flow in a curved tube. J. Fluid Mech. 1973, 57, 167-176]. We demonstrate a step-by-step code revival process and compare original (coarse) results to updated (fine) solutions. The purpose of our paper is to make the code available as modern Fortran for the scientific community. The code runs quickly on modern hardware architectures and enables fast understanding of the physical effects included.