59 poncho 389 in my 59 GMC. The motor has been bored .030 over and stroked 1/2 inch with a eagle forged stroker crank to come up with 447 inches. I am also running an early tripower on this motor. This motor is a direct bolt in replacement for the original 336 inch pontiac v8 that the gmc was born with.
I hate automatics, so this one moves with a 5 speed nv4500. I hope to break the new engine in very soon.
