I appreciate your comments and your experience. I have run it both ways over the 40 years I have been playing with these early 235/261 motors. I have even run it with no heat - terrible idea, left me with a fat sloppy pig of of a motor that took the manifold forever to warm up and sort of run right (hey I was young then and dumb, lol) Then I went to the exhaust heat, it worked and was an improvement. Tom Langdon thereafter convinced me about 20 ears ago (maybe longer now that I think about it) to try hot water. Worked better and less heat to the manifold, sufficient to allow the fuel to atomize but not too hot to have the fuel flash off the moment it hit the manifold. The water heat is the better choice. As you noted, exhaust heat is too hot after the motor is running a while (I agree) while the hot water is temperature regulated by the cooling system. For me anyhow, hot water.
Last edited by mdonohue05; 06/01/17 05:20 PM.
