Posted By badgoldnova on 03/10/2008 4:51 PM
they are checking to see what cubic inch your motor is , not bore size,, it works real well , done did roys car, came out right all the way around , if your looking to lie about your motor size, you need to pull off your header and put a staw under the ex valve, then it will read off . thats how you cheet lol