Anybody ever have any problems with there HT4100 motor in there early 80's cadillac models. the motor was said to be water injected, thats what the h stands for and i heard it was very under powered. it has an alluminum block and cast iron cylinder heads which often caused problems. sometimes coolant would go into the crankcase and cause a milkshake effect. so if anybody has any comments on this motor please state them because i'm abou to buy an 82 coupe deville with 48,000 but it has the ht4100 so i want to be aware of the problems i might face.