hey guys im the guy with the friend who has a fked up crx.

its a 90 Si.. looking at nippon-motors.com it looks like the stock engine is listed as..

88-91 Honda Civic, CRX(SOHC) ZC(SOHC)/D16A6 1.6 L 4 Cyl $395 Si Civic/CRX only

a few lines down they have..

88-91 Honda Performance Engine ZC(DOHC) 4 Cyl $545 Engine+5speed Trans: $600, +ECU: $750; +LSD: $950

what is the diff in his stock motor and the "performance" engine, OTHER than the dohc head?

would this be a worthwhile investment.. because things dont look good and its either going to be $395 or $545 right? might as well spend the extra $150 right?

thanks for the help guys