23 The flexplate is a special part from Cal Pony Cars. If you have a '65-'81 289/302 V-8, you want a 28-ounce offset balance flexplate. If you have a '82-up 5.0L engine, you must go with a 50-ounce offset balance flexplate. Specify what you have when ordering. Here, Gil marks the flexplate and reinforcement ring for easy reference during installation.