If your car experiences hard starting when the engine is warm (or any time), our battery ground cable upgrade kit is for you. Our kit replaces the negative battery cable and the transmission ground cable. To order: http://www.speedlogixstore.com/product_p/cec0j210aa.htm We have installed this on several vehicles, from a 11:1 compression 426 to a 8.5:1 compression 397 and it's fixed all hard starting issues immediately. Here are some comparison pics ... thicker cable is the new one, of course.
Mine seems to crank longer than it used to. Battery replaced not long ago and didn't help. Maybe the aftermarket amps?