both are good motors, each are better than the other one depending on your point of view and just favorite. Everyone will argue that the RB is stronger because it's iron, and everyone else will say the SR is lighter and makes your car handle better.

They both can be built to about the same amount of power on the same mods. About, notice I said about, please god don't quote me on that.

RB is an I6 so that is always a plus, nothing really bad about it...besides it's a 2.0l.

You'll find RB's for cheap all day long, SR's are highway robbery it seems sometimes. Just keep looking around and don't settle on the first motor you find. Research the person you're buying from!!

www.zilvia.net
www.240sxforums.com
www.freshalloy.com
www.240sx.org
www.srswap.com

all good sites to read if you have questions about 240's.

but don't post, just search and lurk for a while. If you post and ask this question you asked here, no one will help you.