Are you sure it's not light? This is nissans premo engine, i don't think they would make it heavy. This is a pretty serious engine upgrade, if you're really going to do it mabye you should get a skyline gearbox and 4.4 lsd diff too. I think the only nissan engine more hardcore than this one would be the twin turbo V8 from the R390 GT-1... I'd like to have one of those in my zed.