I put a 350 in my 51, and the stock radiator would NOT keep the engine cool at highway speeds. I put in an aluminum radiator, and it works great. The other problem is the fan; my V8 sits too low for a regular fan, so I had to put an electric fan in. It takes a big fan to keep a V8 cool. I have a Perma Cool fan that moves 2950 cfm of air, and on hot days sitting in traffic it still will slowly heat up from 180 to 200 degrees. I think it willtake 2 fans moving over 4,000 cfm to keep it steady, especially if I put in air conditioning.
