At what point would acr valves be a good idea with modified engines? I'm running edelbrock performer heads and a screaming eagle cam. Don't know the cam number as it was put in by previous owner. I ask this because I have noticed the starter has a hard time turning over the engine and it kicks back against the starter occasionally. This setup loves to eat starters and batteries. Assuming the acr would be a good idea what brand of valve would be recommended? The bike is a 98 wide glide. Thanks in advance for the help.