I know a lil bit about the 2.4 quad 4 and it actually a motor to be reckened with i dont know if some you guys saw the may issue of superstreet i think it was it had a full article on the motor and all that could be done to it by swapping parts the older quads like the one in the achevia scx had a flywheel rating of 190 7000rpm redline and factory 0-60 times at 6.8 to low 7 range and even today the newer quad 4s can pull 60 in mids 7s handling sucks bad on those cars but there are some serious tuners have gotten really good results out of tuning this motor i believe the older ones are the best found in late 80s early 90s grand ams and achevias they can be tuned for power but dont underestimate the power of the j-bodys when tweaked there torque can get a nasty jump on ya