This is for an engine project that im working on and not to just replace a rod in the Nova .28 motor. I think the rod is possibly longer than the 28.5mm c to c on the .21 rods. Reason being a completely different part number, If Novarossi use a common part in any of their motors irrespective of size of motor they use the same part number. Also with the longer stroke of 17.6 mm and longer piston the piston would be to far into the bottom of the case and backplate at bdc. I really need for some one to measure one. Best regards Martin.