Does anyone know of any Ironman races that does not have cut off times for the individual events?

I tried an Ironman a few years ago, but I am a very slow swimmer and did not make it out of the water in time. I would still like to do the Ironman distance, but do not want to risk the expenses again only to have the same problem. I am sure I can finish in the race in the 17 hours as long as I didn't have to worry about the swim.

I have done 1/2 Ironman without the cut off time and have heard of full Ironmans, but cannot find them any.