@Horton, according to Dan, the boat is a pure pleasure to drive, and he said the wakes are great. No discernible difference. It probably is a little heaver, the Ilmor and the 351W are both iron block, iron heads. But, you do have to factor in electronics, etc. If I were a betting man, I would say it would be minimal. Oh, and yes, had to do some doghouse work.