RustyRatRod said No you'll have more than 300 cubes IF you can do the 305 chebbie piston and the 4.5" crank. Bore X bore X stroke X .785 X number of cylinders (6). 3.875 X 3.875 X 4.5 X .785 X 6 = 318.25616 cubes. Click to expand...