X block sonic test

A lot of power is made in the heads and cam. I built a 318, .030 over with ported x heads and a nice cam. 4 speed car. 73 cuda and I smoked my buddies 70 camaro with a built 350 and 4 speed. 4.040 is stock 340 bore if thats what you measured it at. I loved being able to say, yea its just a 318 in there. Lol.