Bill, Pete gave some good advice and sums up my experience with overflow bottles on Imps. However, if you are experiencing continual overflow and hot running, you may have a hidden condition the overflow tank won't be able to control: Clogged water passages in the Engine Block. My '64 developed this condition and a flush with the block drains open didn't fix it. Probably nothing short of pulling the freeze plugs and scraping and dredging the sediment out will get rid of this situation. My engine rebuilder in Taegu told me about this development after he fixed it by boiling the block (of course, a more drastic approach). Consult the FSM (I can't, mine is in Taegu with the car). Pete's horsepower versus paycheck analogy was beautiful. Again, here I'd like to add that if you're retired U.S. Military the "drag" goes a little further. After the USFSPA (ex-wive's enrichment act) the VA disability offset (you pay for your service injuries), the broken promise of free health care for life, etc., ad nauseum are done with your retirement check, it'll have less available horsepower than a Citroen 2CV engine trying to push a '64 Ghia Landau (Imp content!) to the employment (and you thought you were retired!) office. Thanks Pete! Steve (still working) in Korea __________________________________________________ Do You Yahoo!? Yahoo! Tax Center - online filing with TurboTax http://taxes.yahoo.com/