I agree, sometimes it can. This 1/25 scale V10 looks just fine in this 1/24 Camaro, but it only works because of the size of the V10. That doesn't often work out.
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I think so too. However doing the opposite, it where we tend to have issues. For the most part, a 1/25 scale engine looks decidedly small in a 1/24 scale body. Which brought me to this subject.