yes they do TTI which is what i have on my 73 dart and Maddog does also. i know there is one more but i can nto remember there name. also it will make a diffremce with the 440 if you will be useing the indy-1 or the Indy SR heads witht he raised exhaust ports. mopar65


3520 pound race ready 1973 Street/Strip Dodge Dart - Stock stroke 440/727 10.49 @ 125.0 on 93 pump gas & ET Street Radials. More to come... ( SGT Miller) Proudly served 12 years in the US ARMY RESERVES support our troops