Ooops. I keep forgetting that not everyone in here is a nissan maniac the way I am. FEI the 89 90 240sx was a sohc 2.4L after that they were twincammed. The sohc motor is an absolute pig stock it revs very sluggishly and just does not feel like a nissan motor in general. The twincammed one is the one to have unless youre an sr20det fan.