I would like to communicate with other members regarding finding a solution to overheating problems on early '20's cars. In my situation a flow test of the radiator checked superb and waterpump impeller and function appear to be good. I am wondering if the problem could be caused by blocked passages in the head or block and if someone has used a specific product to open the passages. Also, is a reverse flushing of the block and head ever been advocated as a remedy for overheating. If you have any suggestions that I can try to solve this serious problem I will really appreciate hearing from you. Thank you. Joe Rein 3980 Hillwood Circle, Tucson, Az 85750 (520) 886-7098 jahmrein@cs.com