A/j the motor is 9:5 compression 3.55 gears 904 shift kit roller camshaft. I'm currently getting 13-14 around town with the 318 in the barracuda I know I can squeeze an extra mile in. I'm at 30 degrees total 18 in the dizzy and 12 initial if I bump up the initial I can hear spark knocking at idle I blame my cheap Ecu box hopefully upgrading to an msd box will allow to run more adnavce with no spark knock.i was als thinking of changing to 3.91s since. Do not do any highway driving
