Shrinking doesn't work like that. It shrinks to a 51% ratio, so you'd end up with a 1.5-2" sized head if not smaller. I've seen 7 inch heads shrink to the size of a pea. You could catch it in between the normal size and that 51% size;however, the head distorts while it is shrinking to the 51% size so you'd have a head that was mishapen.The reason for this distortion is the different thicknesses of heads. The jaw may be thinner than the rest.Since the shrinking process is a dehydration of moisture, thicker areas will hold more moisture than thinner areas so will shrink at a slower rate. The best heads for shrinking to the 3.75 " scale are 7 inch heads and larger. Even Marvel Legend heads shrink too small. Hope this helps.