I am running alcohol thru a Holly 750 double pumper on a 400 SBC. I have noticed something that I am not sure what is going on so maybe someone can help explain. I get the water temp up to 170-180 before I make a run. If I leave the water pump off during my burnout and run down the track, the motor will cut out like it is hitting the rev limiter about 60' before the 660' finish line. It doesn't seem to hurt performance because I actually run 0.03-0.05 faster when I leave the water pump off and it cuts out on the top end. Once it reaches 180 and I do a burn out if I turn the water pump on during my run down the track I don't seem cut out on the top end and it runs 0.03-0.05 slower. Is it leaning out? Why would it run faster cutting out? My temp doesn't seem to register higher on the temp gauge after the run and I turn on my water pump. Any one with an ideas what is going on? What can I do to fix the cutting out on the top end without effecting the bottom end?