318 4" bore 3.58" stroke(360)

Post bore the machinist did check a cylinder or two with the sonic checker for fun, even though I did not ask for it, he found .145 to .1" wall thickness, so yes this build is a gamble, but hey, you only live to build wierd things once. The machinist is a mopar guy and has a Super Stock 65 valiant with a 273 rocking a slight offset ground aftermarket forged crank, custom pistons, and extremely worked over 302 heads backed by a 4 speed, picture on the office wall shows it doing a decent wheelie, awesome, I believe he runs in the 10's in the quarter and heard he spins it well past 8k rpm :) He was the only guy in my area with a sbm torque plate, so I was happy to pay more to go to him.