Hy sask42, as I told you in another post, a 224 is a .0625 overbored 216, I believe all the parts except the pistons will interchange. Egge Machine in California specializes in older/antique engine parts, and may have .080 or larger overbore pistons available for the 216. Or if your 224 pistons are in good shape, you could find an old 216 block and have a machine shop bore it to use your 224 pistons. Have you pulled the head off yet to confirm the bore is indeed 3 9/16"?
