Well I dont know if anyone pointed this out but from my experences the spacers on the intake mani work on some motors. I.e the Kl-03 motor thats in the probe gt and mx-6. There manifolds heated up very quickly and I dont have the exact terminology but well the motor temp got a certain degrees the motor automatically retarded the timing which obviously killed performance. So I guess the use on those v-6's were very well documented on
www.probetalk.com but on duratecs it may be different
