i've been trying to find a write up of exactly what will need to be done to put in a 98 ka24de in a 1990 240sx. any links will be great and pics are even better. any help will be deeply appreciated. also a rb25det write up would be nice. thanks.

 

http://www.zilvia.net/f/showthread.php?t=33502

give that link a try.

 

i think that the s13 dohc swap is different than the s14 ka

 

Ask on lookoutdrift.com alot more S-chassis heads on there.

 

not entirely. read a little further..
"For my swap, I used a '95 KA, adjusted to behave like a '92. I used a '92 exhaust manifold, EGR tube, distributor, lower intake plenum, coil, and vacuum routing. To eliminate the secondary butterfly vacuum line, I pinched it and sealed it. I performed a fully stock swap. No EGR or AIV elimination, no intake or cams or otherwise. "

 

rb25det.org

 

ahhhh christ! search dude, its been discussed ALOT. I put a 97 into my 90, switch manifolds, distributors, MAF's, add the s13 dohc coil, get a dohc guage cluster, engine harness(for the dash plug swap out the plugs, put the sohc plug on the end of the dohc harness, match color to color the rest of the wires are extra)....Just PM me if you have any more questions.

 

prob wont find a "full writeup" on the rb25, rb heads like to keep their shit exclusive, and it would be a fairly long writeup, but you can find about 75% of what you need on the usual forums.